I'm using Beatstep Pro straight into my iPad via USB. While a sequence is playing I get a very random increase in volume on various notes that I notice especially on high hat sounds. The sequence can play through 20 or 30 times before I'll hear one High Hat be noticeably louder than the rest. I also notice a small glitch in the overall Drum pattern where a note will kind of stumble and play slightly out of rhythm for just a brief second. This also happens about after 20 or 30 times through a 64 note sequence. It seems like BSP is receiving or sending out a short burst of some kind of CC message very infrequently. I'm actually using iProphet and iMini as 2 of my sound engines on my iPad. I have the Randomness and Probability turned off.