auto-detect Music/FX bus in editor

When a player enters the tree in the editor, if its bus is still the default
"Master" and a "Music" (or "FX") bus exists in the AudioServer, switch to that.
User-customised buses are not overridden.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/DynamicSoundFXPlayer.gd

@@ -18,8 +18,12 @@ extends AudioStreamPlayer
 var _core : DynamicSoundFXPlayerCore;
 
 func _enter_tree() -> void:
-	if Engine.is_editor_hint() and stream == null:
+	if not Engine.is_editor_hint():
+		return;
+	if stream == null:
 		stream = AudioStreamPolyphonic.new();
+	if bus == &"Master" and AudioServer.get_bus_index("FX") != -1:
+		bus = "FX";
 
 func _ready() -> void:
 	_core = DynamicSoundFXPlayerCore.new(self);

src/DynamicSoundFXPlayer2d.gd

@@ -17,8 +17,12 @@ extends AudioStreamPlayer2D
 var _core : DynamicSoundFXPlayerCore;
 
 func _enter_tree() -> void:
-	if Engine.is_editor_hint() and stream == null:
+	if not Engine.is_editor_hint():
+		return;
+	if stream == null:
 		stream = AudioStreamPolyphonic.new();
+	if bus == &"Master" and AudioServer.get_bus_index("FX") != -1:
+		bus = "FX";
 
 func _ready() -> void:
 	_core = DynamicSoundFXPlayerCore.new(self);

src/DynamicSoundFXPlayer3d.gd

@@ -17,8 +17,12 @@ extends AudioStreamPlayer3D
 var _core : DynamicSoundFXPlayerCore;
 
 func _enter_tree() -> void:
-	if Engine.is_editor_hint() and stream == null:
+	if not Engine.is_editor_hint():
+		return;
+	if stream == null:
 		stream = AudioStreamPolyphonic.new();
+	if bus == &"Master" and AudioServer.get_bus_index("FX") != -1:
+		bus = "FX";
 
 func _ready() -> void:
 	_core = DynamicSoundFXPlayerCore.new(self);

src/DynamicSoundPlayer.gd

@@ -42,8 +42,12 @@ func _set(property: StringName, value: Variant) -> bool:
 	return false;
 
 func _enter_tree() -> void:
-	if Engine.is_editor_hint() and stream == null:
+	if not Engine.is_editor_hint():
+		return;
+	if stream == null:
 		stream = AudioStreamPolyphonic.new();
+	if bus == &"Master" and AudioServer.get_bus_index("Music") != -1:
+		bus = "Music";
 
 func _validate_property(property: Dictionary) -> void:
 	if property.name in ["RandomMinPitchScale", "RandomMaxPitchScale"]:

src/DynamicSoundPlayer2d.gd

@@ -41,8 +41,12 @@ func _set(property: StringName, value: Variant) -> bool:
 	return false;
 
 func _enter_tree() -> void:
-	if Engine.is_editor_hint() and stream == null:
+	if not Engine.is_editor_hint():
+		return;
+	if stream == null:
 		stream = AudioStreamPolyphonic.new();
+	if bus == &"Master" and AudioServer.get_bus_index("Music") != -1:
+		bus = "Music";
 
 func _validate_property(property: Dictionary) -> void:
 	if property.name in ["RandomMinPitchScale", "RandomMaxPitchScale"]:

src/DynamicSoundPlayer3d.gd

@@ -41,8 +41,12 @@ func _set(property: StringName, value: Variant) -> bool:
 	return false;
 
 func _enter_tree() -> void:
-	if Engine.is_editor_hint() and stream == null:
+	if not Engine.is_editor_hint():
+		return;
+	if stream == null:
 		stream = AudioStreamPolyphonic.new();
+	if bus == &"Master" and AudioServer.get_bus_index("Music") != -1:
+		bus = "Music";
 
 func _validate_property(property: Dictionary) -> void:
 	if property.name in ["RandomMinPitchScale", "RandomMaxPitchScale"]: