Start button: Pressing it starts playing the music that you have created. Loop button: Pressing it will either loop the music so it repeats or remove looping the music so it will end when the dot reaches the end. A,B,C buttons: Pressing these will make them follow your mouse. Click on them to place them on the timeline. Clear button: Pressing it will delete all notes you have put on the timeline.
All code and art: @ScratchUSER-321