The four SSM VCAs are used to mix the outputs of the four filter stages of
the CEM filter to obtain the different filters. The different filters are
obtained by adding/subtracting the four filter stages:

output = A*stage1 - B*stage2 + C*stage3 - D*stage 4

The factors A,B,C, and D are realized with 4 VCAs (controlled by four analog
voltages that are generated with four microprocessor-controlled DACs and
four voltage controlled slew limiters to obtain the morphing between the
filters).

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von waveform100
> Gesendet: Freitag, 19. August 2005 21:12
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 About the VCA inside the Morphing Filter
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> I have the impression that the Morphing Filters VCA is pretty nice and
> clean. I found a good (and expensive) VCA SSM-Chip on the PCB, but I
> have no idea if thats for the VCA or for the complex filter, without
> following the trace.
>
> So, what IC did Doepfer use on that VCA
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> Yahoo! Groups Links
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