[LAU] Delta 44 slow playback

Hello List, I'm on 64studio 2.1 using a Delta 44 and not getting playback at the proper speed using ALSA. Setting different sample rates in the ENVY24 control increases or decreases playback speed when playing files via Amarok or Audacity. 48000 is close to where it should be, but still too slow; 44100 is extremely slow; 88200 is extremely fast and choppy, etc. Recording and playback is perfect though when I'm using the card with Ardour/Jack. I've disabled my mb's onboard sound device and even increased the PCI latency setting in my BIOS. I'm not sure what else to do. Anyone have any ideas? Many thanks in advance Juan