I had a problem with a lot of loud buzzing coming through my stereo with the audio from my KnoppMyth box connected with a 3.5mm stereo to RCA cable. I just installed a USB Audio Adapter to use instead of the audio jack on the motherboard.

StarTech ICUSBAUDIOB USB to Audio Adapter.

The USB audio adapter works great for TV shows because you can assign dev\dsp1 to be used for TV show playback in the MythTV general settings.

The problem is that most other things seem to use the default, or first audio device available, which is dev/dsp (the noisy on board audio jack). I have tried to rename or copy the devices so that the USB device becomes the dev/dsp or so that dev/dsp becomes dev/dsp2. I'm not having any luck, probably because I'm really not good with linux.

Does anyone have any ideas about how I can configure the flash player, mplayer, and everything else to use my USB audio adapter?

Thanks,
Dan

I had a similar problem a while back. The easiest thing to do would be to disable onboard sound in the bios if possible. My problem was actually that alsa still found the onboard sound even when it was disabled, and here's the way I eventually fixed it:
http://knoppmyth.net/phpBB2/viewtopic.p ... highlight=

I'm not sure how I missed that thread. I'll try all of that stuff and let you know how it turns out.

Thanks,
Dan

Disabling the onboard sound in the BIOS was all that was necessary.

I'm kicking myself for not thinking of that myself.

Thanks for the help.

-Dan