Along these lines, I thought I'd share a recent post to the XWAX developers list (its not chuck related, but maybe someone wants to take some inspiration, and pack the XWAX code into a chuck ugen):
Hey!
I just did a quick hack of wrapping the timcoder.c code into a flext external, so the timecoder can be used in pd or max/msp (dunno about v5) and be used for stuff like scratching videos and alike. This is a very small and easy hack but it works http://karhumusic.sesser.at/vinylcontrol.tar.gz Documentation is in the tarball as vinylcontrol.pd patch with some comments. I left the binaries in the tarball as some might have problems building the external (... next time I should not forget to delete the binaries with debug symbols, heh...).
so long... Niklas