Can not use this app live

Ive been messing around with this app for a few weeks now. Im using it on my iPad 3 paired with my Synthstation 49 controller and every time I use the reverb or release knobs in the app, the instrument distorts horribly; to the point where it literally sounds like I put the delay setting on 100 (that annoying, metallic spring sound that hurts your ears and doesnt stop until you turn everything off).

I really dont understand whats causing this, but please fix it! It is one of my favorite apps to use for performing and recording, but I can not use it at all if its going to distort like this. I even talked to customer service for a good 2-3 weeks and I still cant figure this out. :/ Please fix this! Thank you

Curt Kobane about SampleTank