Reply to Traktor+ableton issues

My current setup is an iPad with lemur controlling bentosans smart mixer and effects with a notivation launchpad with katapult. As for the software: I have traktor pro running audio to ableton live with Jackrouter.

Apart from my setup, I sometimes get random glitching and crackleing which sounds terrible and anoying I checked my activity monitor and neither ableton nor traktor is eating upp my CPU (got a MBP with the 2,7 i7 processor and 8GB RAM) and I reinstalled my sound card twice (audio 2 dj)

So the question is: Could it be my soundcard, jackrouter or my OS (Lion) that is disrupting my audio?