usb audio

[ray]

i have a Sony Vaio PCG-GRZ660, the onboard audio is a Yamaha AC-XG Sound Card. I also have an external creative labs USB Sound Card that i got working with device pcm in my kernel.

The problem i am having is that the audio jumps and skips alot and isnt stable. does anyone know any suggestions??  

the /dev/sndstat line is
pcm0: <USB Audio> at addr ? (1p/0r/0v channels)
pcm1: <Intel ICH3 (82801CA)> at io 0x1c00, 0x18c0 irq 9 bufsz 16384 (1p/1r/0v channels duplex)