[sdiy] MIDI-CV retrofit

[Richard Wentk]

It's not difficult to make all of this switchable. 

I'd have a selector switch for each gate source, with an added OR mode and an added AND mode for when you want to combine them. 

Likewise switchable selection with optional summing for the CV ins. 

Point is musically, there is no one correct solution. Sometimes you'll want to merge the gates, sometimes you won't. 

Considering the circuitry is trivial, adding a set of combination options and choosing between them when you need them seems more useful than hardwiring one solution and getting frustrated when it doesn't do what you need. 

Also, the point of a modular is to be open-ended and creative. Hardwiring specifics is not open-ended. 

If you keep everything separate and switchable as needed, you can do things like run a MIDI sequence through one set of modules and trigger a long filter sweep from the keyboard. Etc.

Richard

On 17 Sep 2013, at 10:08, Carsten Toensmann wrote:

> 
> 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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