I just installed a Lexicon Alpha. Initially, I'm just using it as an audio interface for a midi keyboard to play software instrument apps. I know it says not to use USB hubs, but how about powered hubs? When I first started using the Alpha, I had it going into a small d-Link powered 4-port hub and had no problems. However, on my most recent session, I had severe stuttering behavior with Pianoteq v 6.5.1 on my Mac which didn't happen before. Bypassing the hub eliminated the problem but I'm just curious as to why it worked fine through the hub earlier.