Tuesday, November 20, 2012

Doepfer Usergroup Poll: Voltage Controlled Slope Module

Recently Dieter Doepfer ordered a new poll in the Doepfer A-100 Usergroup.
It looks like he is seriously considering a 'Serge Voltage Controlled Slope' -inspired A-100 module.
If there is enough positive feedback it will be manufactured with the license of the copyright owners of the Serge module ( and it may also have the additions that Ken stone has designed).
Because of the license fee, the module's price will be a bit higher than standard A-100 modules.

Bananalogue Serge VCS PCB
In the early 1970s, Serge Tcherepnin developed the Positive Slew and Negative Slew modules for the original Serge synthesizer.
In time these merged into the classic Dual Universal Slope Generator.(Vimeo link with video)

For example;
The Serge VCS module, (re-)released in conjunction with bananalogue.com was/is an extremely versatile control voltage generator and audio source.
The Bananalogue VCS and CGS75 are both an adaptation of Serge's original circuit with a few new features.
At first glance it seems to be a VC slew limiter but after a closer look you can discover a very versatile module which can be used as a VC-LFO, VCO, AR-envelope, VCF, envelope follower, waveshaper, subharmonic and a trigger delay.

That's nine functions in one module!
It is not sure which functions the Doepfer module will have, but i guess they will try to get the most out of it.

So, the question in the Usergroup is:
" Would you buy a Doepfer A100 'Serge Voltage Controlled Slope' inspired module? "

The poll will remain open for one month, until 19th of December.
Voting is possible at http://launch.groups.yahoo.com/group/Doepfer_a100/surveys?id=13160415 (for Usergroup members)

Find more info at:
http://web.archive.org/web/20080224013413/www.bananalogue.com/vcs.html
For those interested in the theory of operation, I recommend Tim Stinchcombe's page on this subject.