Hi,
after a two month music cd production break I finally finished my 904A voltage controlled low pass filter clone.
It behaves a bit like the ladder filter of a PRODIGY a friend brought to me, especially comparing the non-linearities, although the prodigy ladder has a different architecture (3046 transistor arrays, no range selection).
Here you can find detailled technical desriptions and sound examples:
http://www.analog-monster.de/mmt904a_en.html
Happy new year to all
Carsten