I am trying to use Loopy HD with Helix over USB for both control and audio. I've seen some videos of people doing this but I ran into a problem from the get go. There is an obvious digital audio sync problem. I have not idea where to adjust sync settings on iPAd Pro/Loopy HD and/or on Helix. Anyone familiar with how to set up this duo? Also intend to try it with new Garageband looper; if anyone has experience with this I am also curious to hear about it.... Audiobus is another mystery that I would like to elucidate...