diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..beab9c9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,12 @@
+# Gradle / Android
+.gradle/
+build/
+**/build/
+local.properties
+*.iml
+.idea/
+.DS_Store
+captures/
+*.apk
+*.ap_
+*.aab
diff --git a/README.md b/README.md
index 39e3dea..b179778 100644
--- a/README.md
+++ b/README.md
@@ -9,4 +9,8 @@ Android prototype: music playback adapts to running pace (accelerometer + native
 | [SPECS.md](SPECS.md) | Product intent, MVP scope, **libpasada** DSP responsibilities, Oboe/JNI/MP3 FD assumptions, **jukebox** submodule role |
 | [DESIGN.md](DESIGN.md) | Android architecture decisions, foreground run service, JNI/state machine (`init` / `play` / `pause` / `resume` / `stop` / …), open UI questions |
 
+**App module:** [`app/`](app/) — Jetpack Compose shell (`MainActivity`); **Now Playing** View preview: [`app/src/main/res/layout/activity_now_playing.xml`](app/src/main/res/layout/activity_now_playing.xml) (open → **Design** / **Split**). Icons in [`app/src/main/res/drawable/`](app/src/main/res/drawable/).
+
+Build: open the repo root in Android Studio (bundled JDK **17**), or run `.\gradlew.bat :app:assembleDebug` — on Windows the wrapper picks **`%ProgramFiles%\Android\Android Studio\jbr`** when `JAVA_HOME` is unset (see `gradlew.bat`). On macOS / Git Bash, `gradlew` falls back to Android Studio’s **jbr** under `/Applications/…` or `/c/Program Files/…`.
+
 Submodule: [`jukebox/`](jukebox/).
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
new file mode 100644
index 0000000..3253a46
--- /dev/null
+++ b/app/build.gradle.kts
@@ -0,0 +1,66 @@
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+    id("org.jetbrains.kotlin.plugin.compose")
+}
+
+android {
+    namespace = "at.lockstep.player"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "at.lockstep.player"
+        minSdk = 24
+        targetSdk = 35
+        versionCode = 1
+        versionName = "0.1"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro",
+            )
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+
+    buildFeatures {
+        compose = true
+    }
+
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+}
+
+dependencies {
+    val composeBom = platform("androidx.compose:compose-bom:2024.12.01")
+    implementation(composeBom)
+    androidTestImplementation(composeBom)
+
+    implementation("androidx.core:core-ktx:1.15.0")
+    implementation("androidx.appcompat:appcompat:1.7.0")
+    implementation("com.google.android.material:material:1.12.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.2.0")
+
+    implementation("androidx.activity:activity-compose:1.9.3")
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    implementation("androidx.compose.material3:material3")
+    implementation("androidx.compose.material:material-icons-extended")
+
+    debugImplementation("androidx.compose.ui:ui-tooling")
+}
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..bbac389
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1 @@
+# Add project-specific keep rules here.
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..70bc777
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="true"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.LockstepPlayer">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:theme="@style/Theme.LockstepPlayer">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
diff --git a/app/src/main/java/at/lockstep/player/MainActivity.kt b/app/src/main/java/at/lockstep/player/MainActivity.kt
new file mode 100644
index 0000000..b40fdfe
--- /dev/null
+++ b/app/src/main/java/at/lockstep/player/MainActivity.kt
@@ -0,0 +1,43 @@
+package at.lockstep.player
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import at.lockstep.player.ui.NowPlayingScreen
+import at.lockstep.player.ui.NowPlayingUiState
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContent {
+            MaterialTheme {
+                Surface(modifier = Modifier.fillMaxSize()) {
+                    var progress by remember { mutableFloatStateOf(0f) }
+                    var playing by remember { mutableStateOf(false) }
+                    NowPlayingScreen(
+                        state = NowPlayingUiState(
+                            title = "No track",
+                            artist = "—",
+                            progress = progress,
+                            durationSeconds = 180,
+                            isPlaying = playing,
+                        ),
+                        onProgressChange = { progress = it },
+                        onPrevious = { /* TODO: service / JNI */ },
+                        onTogglePlayPause = { playing = !playing },
+                        onNext = { /* TODO: service / JNI */ },
+                    )
+                }
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/at/lockstep/player/ui/NowPlayingScreen.kt b/app/src/main/java/at/lockstep/player/ui/NowPlayingScreen.kt
new file mode 100644
index 0000000..b9f24a8
--- /dev/null
+++ b/app/src/main/java/at/lockstep/player/ui/NowPlayingScreen.kt
@@ -0,0 +1,154 @@
+package at.lockstep.player.ui
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Pause
+import androidx.compose.material.icons.filled.PlayArrow
+import androidx.compose.material.icons.filled.SkipNext
+import androidx.compose.material.icons.filled.SkipPrevious
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Slider
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+
+data class NowPlayingUiState(
+    val title: String,
+    val artist: String,
+    /** 0f..1f until real timing is wired to Oboe / JNI. */
+    val progress: Float,
+    /** Total track length in seconds (placeholder for UI formatting). */
+    val durationSeconds: Int,
+    val isPlaying: Boolean,
+)
+
+@Composable
+fun NowPlayingScreen(
+    state: NowPlayingUiState,
+    onProgressChange: (Float) -> Unit,
+    onPrevious: () -> Unit,
+    onTogglePlayPause: () -> Unit,
+    onNext: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val elapsed = (state.progress * state.durationSeconds).toInt().coerceIn(0, state.durationSeconds)
+
+    Column(
+        modifier = modifier
+            .fillMaxSize()
+            .padding(horizontal = 24.dp, vertical = 16.dp),
+        verticalArrangement = Arrangement.spacedBy(24.dp),
+    ) {
+        Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
+            Text(
+                text = state.title,
+                style = MaterialTheme.typography.headlineSmall,
+                maxLines = 2,
+                overflow = TextOverflow.Ellipsis,
+            )
+            Text(
+                text = state.artist,
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+        }
+
+        Column(
+            modifier = Modifier.fillMaxWidth(),
+            verticalArrangement = Arrangement.spacedBy(12.dp),
+        ) {
+            Column(
+                modifier = Modifier.fillMaxWidth(),
+                verticalArrangement = Arrangement.spacedBy(4.dp),
+            ) {
+                Slider(
+                    value = state.progress,
+                    onValueChange = onProgressChange,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                ) {
+                    Text(
+                        text = formatMmSs(elapsed),
+                        style = MaterialTheme.typography.labelMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                    Text(
+                        text = formatMmSs(state.durationSeconds),
+                        style = MaterialTheme.typography.labelMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+            }
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceEvenly,
+                verticalAlignment = Alignment.CenterVertically,
+            ) {
+                IconButton(onClick = onPrevious, modifier = Modifier.size(80.dp)) {
+                    Icon(Icons.Default.SkipPrevious, contentDescription = "Previous track")
+                }
+                IconButton(onClick = onTogglePlayPause, modifier = Modifier.size(104.dp)) {
+                    Icon(
+                        imageVector = if (state.isPlaying) Icons.Default.Pause else Icons.Default.PlayArrow,
+                        contentDescription = if (state.isPlaying) "Pause" else "Play",
+                        modifier = Modifier.size(56.dp),
+                    )
+                }
+                IconButton(onClick = onNext, modifier = Modifier.size(80.dp)) {
+                    Icon(Icons.Default.SkipNext, contentDescription = "Next track")
+                }
+            }
+        }
+    }
+}
+
+private fun formatMmSs(totalSeconds: Int): String {
+    val s = totalSeconds.coerceAtLeast(0)
+    val m = s / 60
+    val r = s % 60
+    return "%d:%02d".format(m, r)
+}
+
+@Preview(showBackground = true)
+@Composable
+private fun NowPlayingScreenPreview() {
+    MaterialTheme {
+        var progress by remember { mutableFloatStateOf(0.35f) }
+        var playing by remember { mutableStateOf(true) }
+        NowPlayingScreen(
+            state = NowPlayingUiState(
+                title = "Example Track Title",
+                artist = "Example Artist",
+                progress = progress,
+                durationSeconds = 215,
+                isPlaying = playing,
+            ),
+            onProgressChange = { progress = it },
+            onPrevious = {},
+            onTogglePlayPause = { playing = !playing },
+            onNext = {},
+        )
+    }
+}
diff --git a/app/src/main/res/drawable/ic_pause_24.xml b/app/src/main/res/drawable/ic_pause_24.xml
new file mode 100644
index 0000000..6626e5b
--- /dev/null
+++ b/app/src/main/res/drawable/ic_pause_24.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="?attr/colorOnSurface"
+        android:pathData="M6,19h4V5H6V19zM14,19h4V5h-4V19z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_play_arrow_24.xml b/app/src/main/res/drawable/ic_play_arrow_24.xml
new file mode 100644
index 0000000..54d5a9d
--- /dev/null
+++ b/app/src/main/res/drawable/ic_play_arrow_24.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="?attr/colorOnSurface"
+        android:pathData="M8,5v14l11,-7L8,5z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_skip_next_24.xml b/app/src/main/res/drawable/ic_skip_next_24.xml
new file mode 100644
index 0000000..fb97479
--- /dev/null
+++ b/app/src/main/res/drawable/ic_skip_next_24.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="?attr/colorOnSurface"
+        android:pathData="M6,18l8.5,-6L6,6V18zM16,6h2v12h-2V6z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_skip_previous_24.xml b/app/src/main/res/drawable/ic_skip_previous_24.xml
new file mode 100644
index 0000000..9d1532a
--- /dev/null
+++ b/app/src/main/res/drawable/ic_skip_previous_24.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="?attr/colorOnSurface"
+        android:pathData="M6,6h2v12H6V6zM9.5,12l8.5,6V6L9.5,12z" />
+</vector>
diff --git a/app/src/main/res/layout/activity_now_playing.xml b/app/src/main/res/layout/activity_now_playing.xml
new file mode 100644
index 0000000..8e7805e
--- /dev/null
+++ b/app/src/main/res/layout/activity_now_playing.xml
@@ -0,0 +1,128 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Now Playing — View hierarchy for Android Studio Layout Editor / Design preview.
+  The launcher still uses Compose (see MainActivity); wire this layout when adding a View-based screen.
+-->
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingStart="@dimen/now_playing_horizontal_padding"
+    android:paddingTop="@dimen/now_playing_vertical_padding"
+    android:paddingEnd="@dimen/now_playing_horizontal_padding"
+    android:paddingBottom="@dimen/now_playing_vertical_padding"
+    tools:theme="@style/Theme.LockstepPlayer">
+
+    <TextView
+        android:id="@+id/text_track_title"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:ellipsize="end"
+        android:maxLines="2"
+        android:textAppearance="?attr/textAppearanceHeadlineSmall"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="Example Track Title" />
+
+    <TextView
+        android:id="@+id/text_track_artist"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="4dp"
+        android:ellipsize="end"
+        android:maxLines="1"
+        android:textAppearance="?attr/textAppearanceBodyLarge"
+        android:textColor="?attr/colorOnSurfaceVariant"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/text_track_title"
+        tools:text="Example Artist" />
+
+    <com.google.android.material.slider.Slider
+        android:id="@+id/slider_progress"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="24dp"
+        android:stepSize="0.01"
+        android:value="0.35"
+        android:valueFrom="0"
+        android:valueTo="1"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/text_track_artist" />
+
+    <TextView
+        android:id="@+id/text_position"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="4dp"
+        android:textAppearance="?attr/textAppearanceLabelMedium"
+        android:textColor="?attr/colorOnSurfaceVariant"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/slider_progress"
+        tools:text="1:15" />
+
+    <TextView
+        android:id="@+id/text_duration"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="4dp"
+        android:textAppearance="?attr/textAppearanceLabelMedium"
+        android:textColor="?attr/colorOnSurfaceVariant"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/slider_progress"
+        tools:text="3:35" />
+
+    <androidx.constraintlayout.widget.Barrier
+        android:id="@+id/barrier_after_times"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:barrierDirection="bottom"
+        app:constraint_referenced_ids="text_position,text_duration" />
+
+    <androidx.appcompat.widget.AppCompatImageButton
+        android:id="@+id/button_play_pause"
+        android:layout_width="@dimen/now_playing_play_button_size"
+        android:layout_height="@dimen/now_playing_play_button_size"
+        android:layout_marginTop="12dp"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:contentDescription="@string/cd_play_pause"
+        android:padding="16dp"
+        android:scaleType="fitCenter"
+        app:layout_constraintEnd_toStartOf="@id/button_next"
+        app:layout_constraintHorizontal_chainStyle="spread_inside"
+        app:layout_constraintStart_toEndOf="@id/button_previous"
+        app:layout_constraintTop_toBottomOf="@id/barrier_after_times"
+        app:srcCompat="@drawable/ic_play_arrow_24" />
+
+    <androidx.appcompat.widget.AppCompatImageButton
+        android:id="@+id/button_previous"
+        android:layout_width="@dimen/now_playing_transport_button_size"
+        android:layout_height="@dimen/now_playing_transport_button_size"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:contentDescription="@string/cd_previous_track"
+        android:padding="14dp"
+        android:scaleType="fitCenter"
+        app:layout_constraintBottom_toBottomOf="@id/button_play_pause"
+        app:layout_constraintEnd_toStartOf="@id/button_play_pause"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@id/button_play_pause"
+        app:srcCompat="@drawable/ic_skip_previous_24" />
+
+    <androidx.appcompat.widget.AppCompatImageButton
+        android:id="@+id/button_next"
+        android:layout_width="@dimen/now_playing_transport_button_size"
+        android:layout_height="@dimen/now_playing_transport_button_size"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:contentDescription="@string/cd_next_track"
+        android:padding="14dp"
+        android:scaleType="fitCenter"
+        app:layout_constraintBottom_toBottomOf="@id/button_play_pause"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@id/button_play_pause"
+        app:layout_constraintTop_toTopOf="@id/button_play_pause"
+        app:srcCompat="@drawable/ic_skip_next_24" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
new file mode 100644
index 0000000..d7fefbf
--- /dev/null
+++ b/app/src/main/res/values/dimens.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="now_playing_horizontal_padding">24dp</dimen>
+    <dimen name="now_playing_vertical_padding">16dp</dimen>
+    <dimen name="now_playing_transport_button_size">80dp</dimen>
+    <dimen name="now_playing_play_button_size">104dp</dimen>
+</resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..52f623c
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Lockstep</string>
+    <string name="cd_previous_track">Previous track</string>
+    <string name="cd_play_pause">Play or pause</string>
+    <string name="cd_next_track">Next track</string>
+</resources>
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..9ad9f34
--- /dev/null
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.LockstepPlayer" parent="Theme.Material3.DayNight.NoActionBar" />
+</resources>
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..3cd9b54
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,5 @@
+plugins {
+    id("com.android.application") version "8.6.0" apply false
+    id("org.jetbrains.kotlin.android") version "2.0.21" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.0.21" apply false
+}
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..2e11322
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+android.nonTransitiveRClass=true
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..2c35211
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..b82aa23
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..5d586e5
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,263 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        # Fallback: Android Studio bundled JBR (Git Bash / MSYS path and macOS)
+        if [ -x "/c/Program Files/Android/Android Studio/jbr/bin/java" ]
+        then
+            JAVA_HOME="/c/Program Files/Android/Android Studio/jbr"
+            JAVACMD="$JAVA_HOME/bin/java"
+        elif [ "$( uname )" = Darwin ] && [ -x "/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java" ]
+        then
+            JAVA_HOME="/Applications/Android Studio.app/Contents/jbr/Contents/Home"
+            JAVACMD="$JAVA_HOME/bin/java"
+        else
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+        fi
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..f086f8b
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,103 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+@rem If unset, use Android Studio's bundled JBR (typical Windows install locations)
+if not defined JAVA_HOME (
+  if exist "%ProgramFiles%\Android\Android Studio\jbr\bin\java.exe" (
+    set "JAVA_HOME=%ProgramFiles%\Android\Android Studio\jbr"
+  ) else if exist "%LocalAppData%\Programs\Android Studio\jbr\bin\java.exe" (
+    set "JAVA_HOME=%LocalAppData%\Programs\Android Studio\jbr"
+  )
+)
+
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/jukebox b/jukebox
index 2a7025a..f0df38c 160000
--- a/jukebox
+++ b/jukebox
@@ -1 +1 @@
-Subproject commit 2a7025ae9c0cfe73c06073ea419c4d5b0b501d17
+Subproject commit f0df38c98b2204665d6ca523fcf1ccd7d3b67d2a
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..06b8e9c
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,18 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "lockstep-player"
+include(":app")