panning and attenuation for pickaxe audio cue

src/net/torvald/terrarum/IngameInstance.kt

@@ -5,6 +5,8 @@ import com.badlogic.gdx.Input
 import com.badlogic.gdx.utils.Disposable
 import net.torvald.terrarum.App.printdbg
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
+import net.torvald.terrarum.audio.MusicContainer
+import net.torvald.terrarum.audio.dsp.BinoPan
 import net.torvald.terrarum.gameactors.Actor
 import net.torvald.terrarum.gameactors.ActorID
 import net.torvald.terrarum.gameactors.ActorWithBody
@@ -442,6 +444,16 @@ open class IngameInstance(val batch: FlippingSpriteBatch, val isMultiplayer: Boo
         loadedTime_t = App.getTIME_T()
     }
 
+    open fun playGUIsound(sound: MusicContainer, volume: Double = 1.0, pan: Float = 0f) {
+        App.audioMixer.guiTrack.let {
+            it.currentTrack = sound
+            it.maxVolumeFun= { volume }
+            it.volume = volume
+            it.playRequested.set(true)
+            it.getFilter<BinoPan>().pan = pan
+        }
+    }
+
     /**
      * Copies most recent `save` to `save.1`, leaving `save` for overwriting, previous `save.1` will be copied to `save.2`
      */