U2A

ALSA Configuration
I had a few problems installing my U2A Waveterminal on Gentoo Linux with ALSA sound. It does not work out of the box. Also, if alsaconf is run, the device disappears and has to be reconnected. If you have this problem, don't run alsaconf ever. Also restarting  also may make the device disappear.

Workaround
Check if the device is recognized, using. If not, unplug/replug the device and try again.

If you have another sound card, this other sound card will be the default output. You change this by editing :

pcm.!default { type hw card U2A } ctl.!default { type hw card U2A }

This should work with aplay and libao.