[sdiy] MIDI Velocity on analog synths

rsdio at sounds.wa.com rsdio at sounds.wa.com
Fri Feb 7 09:47:55 CET 2014

Ah, there's the bit I was missing: If you have a monophonic synth  
controller with note priority set up to revert to another held note,  
then it actually does make sense for the velocity to revert at the  
same time, at least by default. But having the option to change this,  
as Roman offers, makes sense in certain scenarios and playing styles.


On Feb 6, 2014, at 23:28, Martin Fay wrote:
> 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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