In case anyone is interested, the most recent set of fixes that 
Takashi Iwai put in the alsa cvs have now fixed the problems with
recording audio (on at least the screamer chipset). I can use the
following method to record...

a .asoundrc with...

pcm.copy {
  type plug
  slave {
  pcm hw
  }
  route_policy copy
}

then...

arecord -d 10 -f cd -t wav -D copy foobar.wav

(speak low if you don't adjust your recording levels with the mixer)

and then...

aplay -c 1 -t raw -r 22050 -f mu_law foobar

works great here. Of course you'll need to update alsa-source, alsa-libs
and alsa-utils from the cvs for this to work. Nice.
                    Jack


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