[sdiy] MIDI-CV retrofit

[Carsten Toensmann]

The problem of gate mixing is that you do a mixing of events. So if you 
don't implement a kind of hierarchy you get chaos. You press a key on the 
keyboard and a "note off" event of your MIDI interface comes 10 msecs 
later - what should the system do? Do you want an "and" or an "or" 
implementation of MIDI events and so on.

Mixing CVs is ok in my opinion, mixing of gate doesn't make sense. Even 
worse if you consider polyphony.

-----Ursprüngliche Nachricht----- 
From: GGG
Sent: Tuesday, September 17, 2013 9:03 AM
To: 'SDIY List'
Subject: [sdiy] MIDI-CV retrofit

Dear collegues,
I need the expert advice! I'm about to add MIDI2CV conventer to my
DIY synth that, as most analogue synths, has CV and Gate controll.
I built several desktop synths without a keyboard, where I used
external CV and Gate jacks with normaling switch lugs - when no external CV
or Gate is plugged in, CV and Gate from MIDI2CV conventer is routed to VCO
and ADSR correspondingly. When I plug in CV and Gate form analoue sequencer,
MIDI gets disconnected. That is easy.
But with built in keyboard things are getting more complicated -
external CV and Gate jacks with switching lugs now disconnect CV and Gate
from the keyboard. So I added a switch that allows me to switch between
external CV/Gate and CV/Gate from MIDI conventer.

But I wonder, if there is some more advanced solution to select
between controll sources, preferably automatically. I mean - when a MIDI
signal appears a device automatically switches to CV and Gate form MIDI
conventer and ignores signals from the keyboard. For CV I considered a DC
mixer - I just mix a CV from Keyboard, External CV and CV form MIDI
conventer. But how to manage Gates? Maybe someone has got across similar
case and can advice me a solution.

Thank you in advance!

Girts






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