Try godot effects buses

default_bus_layout.tres

@@ -1,8 +1,100 @@
-[gd_resource type="AudioBusLayout" load_steps=2 format=2]
+[gd_resource type="AudioBusLayout" load_steps=4 format=2]
 
-[sub_resource type="AudioEffectCompressor" id=1]
+[sub_resource type="AudioEffectCompressor" id=3]
 resource_name = "Compressor"
 
+[sub_resource type="AudioEffectPanner" id=1]
+resource_name = "Panner"
+
+[sub_resource type="AudioEffectDelay" id=2]
+resource_name = "Delay"
+
 [resource]
-bus/0/effect/0/effect = SubResource( 1 )
+bus/0/effect/0/effect = SubResource( 3 )
 bus/0/effect/0/enabled = true
+bus/1/name = "BGM"
+bus/1/solo = false
+bus/1/mute = false
+bus/1/bypass_fx = false
+bus/1/volume_db = 0.0
+bus/1/send = "Master"
+bus/2/name = "BGM0"
+bus/2/solo = false
+bus/2/mute = false
+bus/2/bypass_fx = false
+bus/2/volume_db = 0.0
+bus/2/send = "BGM"
+bus/2/effect/0/effect = SubResource( 1 )
+bus/2/effect/0/enabled = true
+bus/2/effect/1/effect = SubResource( 2 )
+bus/2/effect/1/enabled = true
+bus/3/name = "BGM1"
+bus/3/solo = false
+bus/3/mute = false
+bus/3/bypass_fx = false
+bus/3/volume_db = 0.0
+bus/3/send = "BGM"
+bus/3/effect/0/effect = SubResource( 1 )
+bus/3/effect/0/enabled = true
+bus/3/effect/1/effect = SubResource( 2 )
+bus/3/effect/1/enabled = true
+bus/4/name = "BGM2"
+bus/4/solo = false
+bus/4/mute = false
+bus/4/bypass_fx = false
+bus/4/volume_db = 0.0
+bus/4/send = "BGM"
+bus/4/effect/0/effect = SubResource( 1 )
+bus/4/effect/0/enabled = true
+bus/4/effect/1/effect = SubResource( 2 )
+bus/4/effect/1/enabled = true
+bus/5/name = "BGM3"
+bus/5/solo = false
+bus/5/mute = false
+bus/5/bypass_fx = false
+bus/5/volume_db = 0.0
+bus/5/send = "BGM"
+bus/5/effect/0/effect = SubResource( 1 )
+bus/5/effect/0/enabled = true
+bus/5/effect/1/effect = SubResource( 2 )
+bus/5/effect/1/enabled = true
+bus/6/name = "BGM4"
+bus/6/solo = false
+bus/6/mute = false
+bus/6/bypass_fx = false
+bus/6/volume_db = 0.0
+bus/6/send = "BGM"
+bus/6/effect/0/effect = SubResource( 1 )
+bus/6/effect/0/enabled = true
+bus/6/effect/1/effect = SubResource( 2 )
+bus/6/effect/1/enabled = true
+bus/7/name = "BGM5"
+bus/7/solo = false
+bus/7/mute = false
+bus/7/bypass_fx = false
+bus/7/volume_db = 0.0
+bus/7/send = "BGM"
+bus/7/effect/0/effect = SubResource( 1 )
+bus/7/effect/0/enabled = true
+bus/7/effect/1/effect = SubResource( 2 )
+bus/7/effect/1/enabled = true
+bus/8/name = "BGM6"
+bus/8/solo = false
+bus/8/mute = false
+bus/8/bypass_fx = false
+bus/8/volume_db = 0.0
+bus/8/send = "BGM"
+bus/8/effect/0/effect = SubResource( 1 )
+bus/8/effect/0/enabled = true
+bus/8/effect/1/effect = SubResource( 2 )
+bus/8/effect/1/enabled = true
+bus/9/name = "BGM7"
+bus/9/solo = false
+bus/9/mute = false
+bus/9/bypass_fx = false
+bus/9/volume_db = 0.0
+bus/9/send = "BGM"
+bus/9/effect/0/effect = SubResource( 1 )
+bus/9/effect/0/enabled = true
+bus/9/effect/1/effect = SubResource( 2 )
+bus/9/effect/1/enabled = true

project.godot

@@ -35,7 +35,7 @@ HTML5="*res://scripts/managers/HTML5.gd"
 
 [debug]
 
-settings/fps/force_fps=60
+settings/fps/force_fps=120
 gdscript/warnings/unused_variable=false
 gdscript/warnings/integer_division=false
 

scripts/MusicPlayer.gd

@@ -54,6 +54,7 @@ func _init(tracks: Array, instrument_map: Dictionary):
 	for i in num_tracks:
 		self.players.append(AudioStreamPlayer.new())
 		add_child(self.players[-1])
+		self.players[-1].bus = 'BGM%d' % i
 		self.channel_pointer.append(0)
 		self.channel_instrument_idx.append(0)
 		self.channel_next_pulse.append(0)
@@ -83,6 +84,13 @@ func _init(tracks: Array, instrument_map: Dictionary):
 		self.channel_pitchmod_on.append(0)
 		self.channel_echo_on.append(0)
 		self.channel_echo_volume.append(0)
+		var panner: AudioEffectPanner = AudioServer.get_bus_effect(i+2, 0)
+		panner.set_pan(0.0)
+		var delay: AudioEffectDelay = AudioServer.get_bus_effect(i+2, 1)
+		delay.set_dry(1.0)
+		delay.set_tap1_active(false)
+		delay.set_tap2_active(false)
+		delay.set_feedback_active(false)
 
 func play_channel(channel: int, time_offset: float = 0.0) -> int:
 	# Executes the track events until it hits a note/rest, in which case it returns the pulse count to the next action, or the end of the events, in which case it returns -1
@@ -117,9 +125,11 @@ func play_channel(channel: int, time_offset: float = 0.0) -> int:
 				self.channel_velocity[channel] = event[2]
 			EventType.PAN:  # TODO: implement slides
 				self.channel_pan[channel] = event[1]
+				AudioServer.get_bus_effect(channel+2, 0).set_pan(1.0 - event[1]/127.0)
 			EventType.PAN_SLIDE:  # TODO: implement slides
 				var slide_duration: int = event[1]
 				self.channel_pan[channel] = event[2]
+				AudioServer.get_bus_effect(channel+2, 0).set_pan(1.0 - event[2]/127.0)
 			EventType.PITCH_SLIDE:  # TODO: implement slides
 				var slide_duration: int = event[1]
 				var target_pitch: int = event[2]  # Signed