I hear you ! I do not use Atmel products anymore unless I absolutely have to after they almost put our last company out of business (early ATmega32's) Didn't know they had a problem with V-references though.
So, one way to use an audio board for DC but with questionable upper bandwidth is to use an (external) FM modulator. I think there was a thread about this just recently here on SED ?
I now see why the elderly migrate south for the winter. Yes, I'll trade you ! For a while anyway. boB