Just too complete and answer this thread for later readers: readcd (cdda2wav) need the same privilegs as cdrecord.
-rwsr-xr-x 1 root cdrom 446226 2007-10-24 11:45 /usr/bin/cdrecord -rwsr-xr-x 1 root cdrom 446226 2007-10-24 11:45 /usr/bin/cdda2wav -rwsr-xr-x 1 root cdrom 446226 2007-10-24 11:45 /usr/bin/readcd
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