i've a shell alias 'rsox48s' 
  `rec -r 48000 -c 2 -f s -w -d /dev/audio0 -V 48s.aiff'
and can losslessly encode the 48s.aiff resultant/file (typically music
off the FM broadcast band) with the flac (free lossless audio encoder)
for about a one-third size reduction. some test of the basic flac
options showed that flac's -3 option compressed best per second of cpu.
the bash shell function
play-flac ()
{
    for f; do
 /usr/bin/flac -d -c --force-aiff-format $f | /usr/bin/play -t aiff -
    done
}
allows playing one or more from a console, for example
 $ play-flac *.flac 
will play all the files ending with flac in he current working dir.

... It's all consistent with pages being freed while still in use.  Hugh
Dickins
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