[sdiy] MIDI to CV interface standards..or not..?

[Paul Schreiber]

No, there is not.

Most of the recent ones start with 0V on MIDI note 0. This makes the output 
circuit buffer easy to do.

On my MIDI-CV I set Note 0 to -2.00V and the upper note 127 to +6.00V

Paul S.



----- Original Message ----- 
From: "Jean-Pierre Desrochers" <jpdesroc at oricom.ca>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, January 30, 2012 9:36 AM
Subject: [sdiy] MIDI to CV interface standards..or not..?


>
> Hi list,
>
> I built the following MIDItoCV interface some months ago:
> http://www.arcenson.com/projects/modular/M100%20MIDI%20Interface/Specifications/M100%20MIDI%20Interface%20specs.pdf
>
> I'm now tweaking a new VCO that will be driven by this MIDI interface.
> I have to decide the 'resting ' frequency when nothing
> is connected to it and the settings are FREQ at '0' and RANGE at 8'
> My VCO is a Moog 921B clone.. see the front panel:
> http://moogarchives.com/m921b.htm
>
> I'm now wondering if there is a 'standard' to follow regarding the 
> relationship
> between a received MIDI note value and the resulting CV output
> the MIDI interface should respect and generates (I'm in the 1V/oct league 
> here..)
> (On my MIDI 61 keys keyboard the first left C note produces a C3 MIDI 
> note)
> When my MIDI interface receives this MIDI C3 note it produces 3.00vdc,
> at C4 it produces 4.00vdc, and so on..
> Am I in the good direction here?
> As a comparison I checked a Moog 951 keyboard
> and it generates 0.00vdc for the first left C.
>
> Your help is SOOOOO welcomed !
> JP
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