How do I use a second sound device?

[John L]

My laptop has a built-in sound card which works fine, but I would also
like to be able to use a USB handset.  I load the snd_uaudio driver
and plug in the handset, the /dev/audio1.x and /dev/dsp1.x devices
appear, but then what?

What do I do to get sound applications to use device 1 rather than
device 0?  I have looked at all the man pages I could find and grepped
through many rc.d files, and I'm still mystified.  Any suggestions?

R's,
John