Xpander/Matrix12 filter design

[jwilmin at hzsbg01.nl.lucent.com]

Howdy,

In the Oberheim Xpander/Matrix12, the cem3372 vcf/vca chip is used, right?
This is however a 4-pole low pass vcf. How did uncle Tom manage to make all
those other filter types with this device (high pass, band pass, combinations)??
Or did they use other chips (or discrete designs) in addition, which I don't
know of.

Anyone who knows how this filter section is designed??

Thanks,

Janwillem Wilmink