Hey I think this was noted as a problem; namely the deb wants libs flac7 and quicktime0. Gutsy doesn't have them (it has lqt1 and lf8) and it annoys aptitude to use "dpkg -i --ignore-dependency=$NOGOOD"
to fix apt from complaining I went into /var/lib/dkpg/status and found the pd-extended entry and changed the relevant "depends: " to the gutsy versions. More info here:
http://ubuntuforums.org/archive/index.php/t-187293.html
hope this helps, sorry if it's a repost