Sound: Isn't using the same sound device i have set in ubuntu 9.10

[pcvii]

ALSA: Advanced Linux Sound Architecture Driver Version 1.0.20.
ALSA Driver: 0: VIA 8237 [V8237], device 0: VIA 8237 [VIA 8237], 4/4 subdevices avail
ALSA Driver: 0: VIA 8237 [V8237], device 1: VIA 8237 [VIA 8237], 1/1 subdevices avail
ALSA Driver: 1: C-Media USB Headphone Set [default], device 0: USB Audio [USB Audio], 1/1 subdevices avail
ALSA: Mixing at 44100hz
Sound driver: ALSA-sw
Lights driver: SystemMessage
Lights driver: Export

I have tried different settings in preferences.ini but I don't know what to set it to to force this to play though my usb headphones. in ubuntu I just have to select what gets outputted to in Sound Preferences

[pcvii]

I also noticed that while plugging into my onboard sound card the audio is over amplified and it gets distorted.

[pcvii]

oh encase your wondering i'm using Stepmania 4.0 from the SVN I compiled it on Nov 4th 2009