Start....

Editor/Scenes/Dialogues/TrackEditor/TrackEditor.gd

@@ -0,0 +1,7 @@
+extends WindowDialog
+
+onready var hbox = $HBox
+
+func _popup(instrument_name, settings, editor):
+	window_title = "Edit %s" % instrument_name
+	popup()

Editor/Scenes/Dialogues/TrackEditor/TrackEditor.tscn

@@ -1,13 +1,36 @@
-[gd_scene format=2]
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://Editor/Scenes/Dialogues/TrackEditor/TrackEditor.gd" type="Script" id=1]
 
 [node name="TrackEditor" type="WindowDialog"]
 margin_right = 48.0
 margin_bottom = 40.0
 rect_min_size = Vector2( 876, 480 )
 window_title = "Track Editor"
+script = ExtResource( 1 )
+
+[node name="HBox" type="HBoxContainer" parent="."]
+margin_right = 40.0
+margin_bottom = 40.0
+
+[node name="Control" type="Control" parent="HBox"]
+margin_right = 40.0
+margin_bottom = 40.0
+
+[node name="VBox" type="VBoxContainer" parent="HBox"]
+margin_right = 40.0
+margin_bottom = 40.0
+
+[node name="HBox" type="HBoxContainer" parent="HBox/VBox"]
+margin_right = 40.0
+margin_bottom = 40.0
 
-[node name="HBoxContainer" type="HBoxContainer" parent="."]
-anchor_right = 1.0
-anchor_bottom = 1.0
+[node name="NoteNameScrol" type="ScrollContainer" parent="HBox/VBox/HBox"]
+margin_right = 40.0
+margin_bottom = 40.0
+
+[node name="NotesScrol" type="ScrollContainer" parent="HBox/VBox/HBox"]
+margin_right = 40.0
+margin_bottom = 40.0
 
 [connection signal="popup_hide" from="." to="." method="_unpopup"]

Editor/Scenes/SongEditor/SongEditor.gd

@@ -2,12 +2,12 @@ extends VBoxContainer
 
 # Signals
 signal playback_finished()
-signal track_pressed (name)
+signal track_pressed (name, settings, editor)
 
 const BASE_SONG_SCRIPT = """extends SongScript
 
 func song():
-	track("%s", [
+	track("Square", [
 		# Place your notes here
 	])
 	pass"""
@@ -28,7 +28,7 @@ func add_track(instrument: Button):
 	var name = track_name.instance()
 	name.set_instrument(instrument.icon, instrument.text)
 	names.add_child(name)
-	name.connect("pressed", self, "emit_signal", ["track_pressed", instrument.text])
+	name.connect("pressed", self, "emit_signal", ["track_pressed", instrument.text, instrument.settings])
 
 	# TODO: Hacky code
 	var inst := GoDAW.get_instrument(instrument.text)
@@ -80,4 +80,4 @@ func project_changed(project: Project):
 	if project.song_script:
 		song_script_editor.text = project.song_script
 	else:
-		song_script_editor.text = BASE_SONG_SCRIPT % "Square"
+		song_script_editor.text = BASE_SONG_SCRIPT

Themes/Default/ButtonIcons/Paint_Active.svg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/Paint_Active.svg-9463c9e117517180ef1a7d67647eeec1.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://Themes/Default/ButtonIcons/Paint_Active.svg"
+dest_files=[ "res://.import/Paint_Active.svg-9463c9e117517180ef1a7d67647eeec1.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

Themes/Default/ButtonIcons/Paint_Inactive.svg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/Paint_Inactive.svg-db9fef898e648bb4726192124a33c375.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://Themes/Default/ButtonIcons/Paint_Inactive.svg"
+dest_files=[ "res://.import/Paint_Inactive.svg-db9fef898e648bb4726192124a33c375.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0