In .asoundrc, find the line in pcm.dmixer that says hw:0,0 and change the first 0 to a 1 or 2, then go into ctl.dmixer and change the number after card to the same value.
That's done it! I changed the 0 to a 1 in both places, and now I'm sailing.
Thanks everyone for the great advice. Every step was very clear and helpful.
Dave