[sdiy] MIDI Velocity on analog synths

Martin Fay martin at martinfay.com
Fri Feb 7 08:28:51 CET 2014


Hi Brian,

At Note Off the pitch CV may need to "revert" to another held note  
depending on the note priority scheme, in this case I've not reverted  
velocity.

PS yes, I was driving the Pro One with a Kenton Pro-2.

Martin

Sent from my iPhone

On 7 Feb 2014, at 06:01, rsdio at sounds.wa.com wrote:

> I could be overlooking some detail, but I would say that every  
> voltage except Gate should be held until the next update (and fore  
> Velocity, that update comes with Note On).
>
> I mean, envelope control voltages should progress according to their  
> rate and level settings, frequency should be updated at Note On and  
> held steady until a new note, and all other CV values should pretty  
> much stay put until specifically updated. The Gate signal is the  
> only analog thing that should change at Note Off, besides Note Off  
> Velocity. Of course, envelopes will response to Gate Off by  
> beginning their release, but envelope outputs are always under their  
> own control.
>
> Those of you with more modular experience than me (or even non- 
> modular analog CV systems) are welcome to enlighten the readers if  
> there's something wrong or something I've missed.
>
> ... or, to put it another way, what is a voltage supposed to change  
> to when a note ends? There is no defined value other than the most  
> recent value. What do analog sequencers do with the voltage between  
> steps? I've always assumed that they hold the previous value until a  
> new update occurs, rather than dropping back to 0 V, but I guess  
> that's a potential implementation.
>
> Brian Willoughby
> Sound Consulting
>
>
> On Feb 6, 2014, at 21:35, Quincas Moreira wrote:
>> I have Roman's midi implant, and it has a nifty feature.  You can  
>> program it with sys.ex. to hold the voltage in cv 2 (which i use  
>> for velocity) until the next note-on message.  This is useful for  
>> when you have a sound with long decay, so you don't get a jump in  
>> the velocity value when you let go of the key.
>>
>> Quincas
>>
>> On Thu, Feb 6, 2014 at 9:35 PM, <rsdio at sounds.wa.com> wrote:
>>> I was going to ask how you assigned velocity to anything with a  
>>> stock Pro-One, but I suppose you used a MIDI-to-CV converter.
>>>
>>> Brian
>>>
>>> On Feb 6, 2014, at 06:14, Martin Fay wrote:
>>>> As a countering point, when I had a Pro-One I used velocity to  
>>>> control cutoff, so certainly _I_ found that musically useful ;)
>>>>
>>>> Martin
>>>>
>>>> On 6 Feb 2014, at 09:17, Florian Anwander <fanwander at mnet- 
>>>> online.de> wrote:
>>>>> Am 05.02.2014 19:11, schrieb MTG:
>>>>>> I imagine when an Note-On arrives you
>>>>>> apply the velocity value (voltage) to VCF Cutoff or Resonance or
>>>>>> whatever,
>>>>> Just aside the 0V question: I'd never direct the velocity to the  
>>>>> cutoff only, but always to the amounts of the envelopes.
>>>>>
>>>>> Florian
>>
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