From james_eaton@btopenworld.com Wed Dec 19 02:03:56 2012
Subject:Re: Standalone analog C/V?

You could estimate the length of the percussion using signal processing in the frequency domain, but then you would be introducing this technology into an analogue device. You could just have a knob...It will sound a bit weird though if you're playing chords on the lower manual as the C/V will either not be there for fast runs or intermittently appear. Maybe it doesn't matter, but isn't the contrast between the dry percussion and the shimmering tone underneath part of the sound? VK-7 owners will love your device but for others there will be compromises.

A bit of market analysis might be beneficial...i.e.
Which keyboards have C/V poor enough to necessitate such a device? And can it be introduced into the signal path through a mod?
80s Korg CX3 - YES
Hammond Suz XB2 - YES
Later HS keyboards ??? Does the XK3 have an analogue input to the C/V effect internally or is it still in the digital signal path?
Estimate how many of these keyboards are still being used?
Can those people afford your device and the installation cost?
What will be the cost of sale? i.e. How will you get to these people and convince them they need your device?

The answer is probably that this is not economically viable but it might still be fun to do, although there are existing analogue C/V simulators on the 'net with schematics and PCBs available:
http://www.jhaible.de/interpolating_scanner_and_scanvib/jh_interpolating_scanner_and_scanvib.html
http://homepage.ntlworld.com/henry01/hammondicon/ham01_text.htm
and this!
http://zk3.hammondforum.com/archives/1996.02.february/msg00840.html