Click once on the notes to select them, once selected, click again, anywhere, to place the note. Press space to exit edit mode. Use the Number sprites at the top to change the tempo. (The program starts at speed:0) Use the up and down arrows to change the octave of the notes you place Press 'd' when your mouse is over a note to delete it.
Credit to @muchorojo for coding help His game: http://scratch.mit.edu/projects/25432214/ More features coming soon! -Note Length -More Space to Place Notes -Built in Songs