diff --git a/gradle.properties b/gradle.properties
index d09c915..d36eb87 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-korgePluginVersion=1.5.6.1
+korgePluginVersion=1.5.6.2
 
 org.gradle.jvmargs=-Xmx1536m
 org.gradle.parallel=true
diff --git a/sample-polyphonic/.gitignore b/sample-polyphonic/.gitignore
new file mode 100644
index 0000000..796b96d
--- /dev/null
+++ b/sample-polyphonic/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/sample-polyphonic/build.gradle b/sample-polyphonic/build.gradle
new file mode 100644
index 0000000..5cf524d
--- /dev/null
+++ b/sample-polyphonic/build.gradle
@@ -0,0 +1,5 @@
+apply plugin: "korge"
+
+korge {
+	id = "com.soywiz.samples.polyphonic"
+}
diff --git a/sample-polyphonic/src/commonMain/kotlin/main.kt b/sample-polyphonic/src/commonMain/kotlin/main.kt
new file mode 100644
index 0000000..8572817
--- /dev/null
+++ b/sample-polyphonic/src/commonMain/kotlin/main.kt
@@ -0,0 +1,413 @@
+import com.soywiz.kmem.*
+import com.soywiz.korau.sound.*
+import com.soywiz.korge.*
+import com.soywiz.korio.async.*
+
+// https://github.com/pspdev/pspsdk/blob/master/src/samples/audio/polyphonic/main.c
+suspend fun main() = Korge {
+	println("Polyphonic sample by Shine")
+	println()
+	println("Soundtrack of the movie")
+	println("\"Le fabuleux destin d'Amelie Poulain\"")
+	println("by Yann Tiersen")
+
+	val maxAt = SAMPLE_COUNT / 16
+	for (i in 0 until SAMPLE_COUNT) {
+		sample[i] = when {
+			i < maxAt -> (i.toFloat() / maxAt.toFloat() * 2f - 1f)
+			else -> (1f - (i - maxAt).toFloat() / (SAMPLE_COUNT - maxAt).toFloat() * 2f)
+		}
+	}
+	var base = 40.0f
+	for (i in 0 until OCTAVE_COUNT) {
+		createPitches(base, octaves[i])
+		base *= 2f
+	}
+	channelStates[0].noteIndex = 0; nextNote(0)
+	channelStates[1].noteIndex = 0; nextNote(1)
+
+	for (nchannel in 0 until 2) {
+	//for (nchannel in 0 until 1) {
+		launchImmediately {
+			//AudioTone.generate(0.25.seconds, 440.0).playAndWait()
+			val stream = nativeSoundProvider.createAudioStream(44100)
+			stream.start()
+			while (true) {
+				//val samples = AudioSamples(1, 44100 * 6)
+				val samples = AudioSamples(1, 4410)
+				//val samples = AudioSamples(2, 44100)
+				//val samples = AudioSamples(1, 44100)
+				audioOutCallback(nchannel, samples.data[0], samples.data[0].size)
+				for (n in 1 until samples.channels) {
+					arraycopy(samples.data[0], 0, samples.data[n], 0, samples.data[0].size)
+				}
+				//MemorySyncStream().apply { writeShortArrayLE(samples.data[0]) }.toByteArray().writeToFile("/tmp/data.raw")
+				//for (n in 0 until 44100) println(samples.data[0][n])
+				stream.add(samples)
+			}
+		}
+	}
+}
+
+const val SAMPLE_COUNT = 0x10000
+val sample = FloatArray(SAMPLE_COUNT)
+
+const val SAMPLE_RATE = 44100
+
+const val OCTAVE_COUNT = 6
+
+val octaves = Array(6) { FloatArray(12) }
+
+data class Note_t(val note: Int, val octave: Int, val duration: Int)
+data class ChannelState_t(
+	var currentNote: Note_t = Note_t(0, 0, 0),
+	var noteIndex: Int = 0,
+	var currentTime: Int = 0,
+	var currentsampleIndex: Float = 0f,
+	var currentsampleIncrement: Float = 0f
+)
+
+val channelStates = Array(3) { ChannelState_t() }
+
+// "S" means "#"
+const val NOTE_END = -2
+const val NOTE_PAUSE = -1
+const val NOTE_C = 0
+const val NOTE_CS = 1
+const val NOTE_D = 2
+const val NOTE_DS = 3
+const val NOTE_E = 4
+const val NOTE_F = 5
+const val NOTE_FS = 6
+const val NOTE_G = 7
+const val NOTE_GS = 8
+const val NOTE_A = 9
+const val NOTE_AS = 10
+const val NOTE_B = 11
+
+fun EIGHT_NOTE(note: Int, octave: Int, duration: Int) = Note_t(note, octave, SAMPLE_RATE * duration / 8)
+
+var channel0 = arrayOf<Note_t>(
+	EIGHT_NOTE(NOTE_D, 4, 7),
+	EIGHT_NOTE(NOTE_E, 4, 1),
+	EIGHT_NOTE(NOTE_F, 4, 1),
+	EIGHT_NOTE(NOTE_E, 4, 1),
+	EIGHT_NOTE(NOTE_F, 4, 1),
+	EIGHT_NOTE(NOTE_E, 4, 1),
+	EIGHT_NOTE(NOTE_A, 3, 9),
+	EIGHT_NOTE(NOTE_B, 3, 2),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_D, 4, 7),
+	EIGHT_NOTE(NOTE_E, 4, 1),
+	EIGHT_NOTE(NOTE_F, 4, 1),
+	EIGHT_NOTE(NOTE_E, 4, 1),
+	EIGHT_NOTE(NOTE_F, 4, 1),
+	EIGHT_NOTE(NOTE_E, 4, 1),
+	EIGHT_NOTE(NOTE_A, 3, 9),
+	EIGHT_NOTE(NOTE_G, 3, 3),
+	EIGHT_NOTE(NOTE_A, 3, 7),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_E, 3, 9),
+	EIGHT_NOTE(NOTE_F, 3, 2),
+	EIGHT_NOTE(NOTE_G, 3, 1),
+	EIGHT_NOTE(NOTE_A, 3, 7),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_E, 3, 12),
+	EIGHT_NOTE(NOTE_D, 4, 9),
+	EIGHT_NOTE(NOTE_C, 4, 3),
+	EIGHT_NOTE(NOTE_B, 3, 6),
+	EIGHT_NOTE(NOTE_A, 3, 6),
+	EIGHT_NOTE(NOTE_D, 4, 7),
+	EIGHT_NOTE(NOTE_E, 4, 1),
+	EIGHT_NOTE(NOTE_E, 4, 1),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_B, 3, 6),
+	EIGHT_NOTE(NOTE_A, 3, 6),
+	EIGHT_NOTE(NOTE_C, 4, 9),
+	EIGHT_NOTE(NOTE_B, 3, 3),
+	EIGHT_NOTE(NOTE_E, 3, 12),
+	EIGHT_NOTE(NOTE_C, 4, 7),
+	EIGHT_NOTE(NOTE_D, 4, 1),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_C, 4, 1),
+	EIGHT_NOTE(NOTE_B, 3, 1),
+	EIGHT_NOTE(NOTE_E, 3, 12),
+	Note_t(NOTE_END, 0, 0)
+)
+
+var channel1 = arrayOf<Note_t>(
+	EIGHT_NOTE(NOTE_D, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_D, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_A, 0, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_B, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_B, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_A, 0, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_D, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_D, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_A, 0, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_B, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_B, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_A, 0, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_F, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_C, 3, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_F, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_C, 1, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_C, 1, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_F, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_C, 3, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_F, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_C, 1, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_C, 1, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_D, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_D, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_A, 0, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_B, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_B, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_A, 0, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_D, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_D, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_A, 0, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_B, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_B, 1, 1),
+	EIGHT_NOTE(NOTE_A, 1, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_A, 0, 1),
+	EIGHT_NOTE(NOTE_E, 1, 1),
+	EIGHT_NOTE(NOTE_F, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_C, 3, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_F, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_C, 1, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_C, 1, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_F, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_C, 3, 1),
+	EIGHT_NOTE(NOTE_A, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_F, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_F, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_C, 1, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_G, 2, 1),
+	EIGHT_NOTE(NOTE_E, 2, 1),
+	EIGHT_NOTE(NOTE_D, 2, 1),
+	EIGHT_NOTE(NOTE_C, 2, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	EIGHT_NOTE(NOTE_C, 1, 1),
+	EIGHT_NOTE(NOTE_G, 1, 1),
+	Note_t(NOTE_END, 0, 0)
+)
+
+val channels = arrayOf(channel0, channel1)
+
+fun nextNote(channel: Int) {
+	val state = channelStates[channel]
+	state.currentNote = channels[channel][state.noteIndex]
+	state.currentTime = 0
+	state.currentsampleIndex = 0f
+	val note = state.currentNote.note
+	if (note == NOTE_PAUSE) {
+		state.currentsampleIncrement = 0f
+	} else {
+		state.currentsampleIncrement = octaves[state.currentNote.octave][note] * (SAMPLE_COUNT.toFloat()) / (SAMPLE_RATE.toFloat())
+	}
+
+	state.noteIndex++
+	if (channels[channel][state.noteIndex].note == NOTE_END) state.noteIndex = 0
+}
+
+// calculate current value of attack/delay/sustain/release envelope
+fun adsr(time: Float, duration: Float): Float {
+	if (time < 0.0f) return 0.0f
+	val attack = 0.004f
+	val decay = 0.02f
+	val sustain = 0.5f
+	val release = 0.08f
+	var time = time
+	var duration = duration
+	duration -= attack + decay + release
+	if (time < attack) return time / attack
+	time -= attack
+	if (time < decay) return (decay - time) / decay * (1.0f - sustain) + sustain
+	time -= decay
+	if (time < duration) return sustain
+	time -= duration
+	if (time < release) return (release - time) / release * sustain
+	return 0.0f
+}
+
+fun audioOutCallback(channel: Int, buf: ShortArray, reqn: Int = buf.size, bufn: Int = 0, nchannels: Int = 1) {
+	val state = channelStates[channel]
+	var bufn = bufn
+	for (i in 0 until reqn) {
+		val time = (state.currentTime.toFloat()) / (SAMPLE_RATE.toFloat())
+		if (state.currentTime++ == state.currentNote.duration) {
+			nextNote(channel)
+		}
+		var value: Float
+		if (state.currentsampleIncrement == 0.0f) {
+			value = 0.0f
+		} else {
+			value = sample[state.currentsampleIndex.toInt()] * adsr(time, (state.currentNote.duration.toFloat()) / (SAMPLE_RATE.toFloat()))
+			value *= 0x7000f
+			state.currentsampleIndex += state.currentsampleIncrement
+			if (state.currentsampleIndex >= SAMPLE_COUNT) state.currentsampleIndex -= SAMPLE_COUNT.toFloat()
+		}
+		val rvalue = value.clamp(Short.MIN_VALUE.toFloat(), Short.MAX_VALUE.toFloat()).toShort()
+		//for (n in 0 until nchannels) buf[bufn++] = value.toShort()
+		buf[bufn++] = rvalue
+		//buf[bufn++] = rvalue
+	}
+}
+
+fun createPitches(base: Float, target: FloatArray) {
+	var base = base
+	for (i in 0 until 12) {
+		target[i] = base
+		base *= 1.0594630943592952645618252949463f  // 2^(1/12)
+	}
+}