I need an editable drum machine for band practice using an iPad Air. I need acoustic kits, not boomps, beeps, bops, and squeaks. I need simple patterns: shuffle, rock, latin. I have the funk covered (Funk Rhythms). I need to be able to create and edit songs. Midi in/out would be most helpful; I could then import EZ drummer, 3rd party patterns I have purchased, and those I have created in Reaper. Drum Session looks interesting but there is little feedback on it. What are people using?