[LAU] Jack problem?

Hello guys! I'm trying out the pianoteq-trail, which is awesome! But I get pretty bad performance, and when I start the app I get this error-msg: Midi thread could not acquire real-time scheduling, error 1 -- Operation not permitted Midi thread could not acquire real-time scheduling, error 1 -- Operation not permitted Midi thread could not acquire real-time scheduling, error 1 -- Operation not permitted Jack error: Cannot use real-time scheduling (RR/5)(1: Operation not permitted) Jack error: AcquireRealTime error Multi-core: could not acquire real-time scheduling, error 1 -- Operation not permitted Do you guys have any idea what the problem might be? Googling it has given me nothing so far! I have both my username and the groupname "audio" setup properly in limits.conf (rtprio, nice and so on) via a tutorial I found a while back. I'm using ubuntu studio 10.04 but with the latest 2.6.38-1-generic kernel. Best regards!