[sdiy] Help from the brain trust: Keyboard ideas

David dingebre at 3dphysics.net
Tue Jun 14 18:38:34 CEST 2011

Thanks Laurie.


-- -----Original Message-----
-- From: Elby Designs [mailto:elby_designs at ozemail.com.au]
-- Sent: Tuesday, June 14, 2011 1:41 AM
-- To: 'David'; 'Synth DIY'
-- Subject: RE: [sdiy] Help from the brain trust: Keyboard ideas
-- I have a similar scenario (I think) with an ARP Odyssey where I am
-- the ARP keyboard with a MIDI keyboard. As the ARP generates 2 voltages
-- the duo-phonic action as well as a GATE and a TRIGGER, I am simply
-- software for my MIDI-CV to generate similar outputs. This way ANY MIDI
-- controller will work. The idea is to use 2 MIDI Channels, one for each
-- The ARP actually generates a master keyboard voltage which is fed to both
-- VCOs and then when a 2nd key is pressed it generates a `difference
-- which is applied to VCO2 to generate the 2nd note. Relatively easily to
-- implement in code once you have established the voltage relationships
-- required.... :)
-- Best Regards
-- Laurie Biddulph
-- Mobile: 0400 257 645
-- Web: www.elby-designs.com
-- -----Original Message-----
-- From: synth-diy-bounces at dropmix.xs4all.nl
-- [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of David
-- Sent: Tuesday, 14 June 2011 4:48 PM
-- To: 'Synth DIY'
-- Subject: [sdiy] Help from the brain trust: Keyboard ideas
-- There are a lot of solutions to get a CV out of a modern keyboard and I
-- a MIDI-2-CV converter and a .COM keyboard controller which directly
-- a CV, gate, trigger, and velocity.
-- My dilemma is a bit different. I'm trying to finish my Synthasystem and
-- last thing I want to finish is the duo-phonic keyboard Nyle designed. I
-- a keybed which mimics an old Pratt-Read keybed.
-- I had three ideas:
-- 1. Hack a Fatar keybed and hook into the switches.
-- 2. Use some Doepfer electronics which eventually output a TTL level
-- at each key press and use the voltage to operate a small solid state
-- connected to each key.
-- 3. Hack a Fatar keybed and replace the switches with micro switches.
-- I know it is a bit odd to move backwards, but the duophonic electronics
-- built around a resistor ladder and a bus type keybed and I'd love to put
-- this last piece of the puzzle in. I'd like a solution which doesn't
-- trying to find an old bus keybed with all their problems. I'd rather use
-- modern matrixed keybed.
-- I've hit a wall with this and would love some divergent thinking.
-- Thanks in advance.
-- David
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