[LAU] Horrible number of xruns in Jack (Emu card)

I hope someone can help me with this. I have: Athlon64 Dual-Core 6000+ 2GB DDR3 RAM, running dual-channel 3 x SATA hard disks Emu 1212m sound card Ubuntu Studio 7.10 (Gutsy, I think) Trying to run JACK at 44.1khz, at a 128 sample buffer I'm getting on the order of 50-60 xruns a second. Even at a 4096 sample buffer, I was getting one xrun every 2 seconds. I would think this setup should be able to handle a 64 sample buffer without any trouble. The one caveat is I did have to compile the latest stable ALSA from scratch, so that my sound card would work. Could it be related to the still-beta driver for my Emu card? Or maybe I need to recompile ALSA with some options? Thank you for any help. -- Darren Landrum