Looking back I think I should have added more feedback to inputs on the game in general. The color changes on the button correspond to when you are supposed to hit the button. When it first changes it is the person trying to jump who is supposed to hit it and then when it changes again the person being jumped is supposed to hit it if that makes sense. Kind of like a game of Rock Paper Scissors. You can push the buttons I just didn't think to add feedback to when you hit the buttons and there are keyboard inputs you can use as well if you don't want to use the on screen buttons. To answer your question though I use LMMS for music/sound effects.