Remember voice states SATB

composeApp/src/desktopMain/kotlin/mg/dot/feufaro/midi/MidiPlayer.kt

@@ -6,6 +6,7 @@ import kotlinx.coroutines.launch
 import mg.dot.feufaro.FileRepository
 import java.io.ByteArrayInputStream
 import java.io.File
+import java.util.prefs.Preferences
 import javax.sound.midi.MidiSystem
 import javax.sound.midi.Sequencer
 import javax.sound.midi.Synthesizer //import javax.sound.midi.ShortMessage
@@ -27,6 +28,7 @@ actual class MediaPlayer actual constructor(
         null
     }
 
+    private val prefs = Preferences.userRoot().node("mg.dot.feufaro")
     private var synthetizer = MidiSystem.getSynthesizer() as Synthesizer?
 
     private var pointA: Long = -1L
@@ -53,6 +55,7 @@ actual class MediaPlayer actual constructor(
         val file = File(filename)
         if (file.exists()){
             sequencer?.sequence = MidiSystem.getSequence(file)
+            loadVoiceStates()
             applyVoiceStates()
             sequencer?.addMetaEventListener { meta ->
                 if(meta.type == 47){
@@ -170,6 +173,7 @@ actual class MediaPlayer actual constructor(
 
     actual fun toggleVoice(index: Int) {
         voiceStates[index] = !voiceStates[index]
+        saveVoiceStates()
         applyVoiceStates()
     }
 
@@ -231,4 +235,20 @@ actual class MediaPlayer actual constructor(
             e.printStackTrace()
         }
     }
+
+    private fun saveVoiceStates() {
+        val data = voiceStates.joinToString(",")
+        prefs.put("voice_states", data)
+    }
+
+    private fun loadVoiceStates() {
+        val defaultValue = "true,true,true,true"
+        val savedData = prefs.get("voice_states", defaultValue)
+
+        val states = savedData.split(",").map { it.toBoolean() }
+        for (i in 0 until 4) {
+            if (i < states.size) voiceStates[i] = states[i]
+        }
+    }
+
 }