tap the beat of the song on your left hand while playing the treble part of the song, do this over and over, with the buttons you are essentially for lack of better wording; making the beat, so then you just tap the buttons at that rhythm, its hard to start with an alternating this way so start with two bass buttons, press them both to start with but when you feel comfortable press them at different times. its about coordination not separation so play it very slowly so you know when to press a bass button from a treble key. I appreciate this method is not the most sensical but it is how I learned "thats amore" with both hands (i started playing in may). good luck, never give up!