[sdiy] MIDI to CV question - no Triggers?

[Carsten Tönsmann]

Hi Dave,

of course the monoflop can only make a pulse from a (new) gate, so this 
works only if you get a new gate (short period of 'low' gate signal) during 
a key event. This can help you if you want to retrigger a device while using 
a MIDI interface which only has an (interrupted) gate output. Unfortunately 
I don't know professional MIDI converters (as I built one myself for my own 
specifications and needs), but you are right: at least one information 
should be provided for new key events (beside CV change): a trigger pulse or 
a gate interrupt. This information should be provided in the device 
specifications, and can possibly be configured. But if your needs are too 
specific (guitar interface) it might be an option to build it yourself.

Carsten

----- Original Message ----- 
From: "D A F" <polaris30 at ncx.com>
To: "Carsten Tönsmann" <carsten at analog-monster.de>; "synthdiy" 
<synth-diy at dropmix.xs4all.nl>
Sent: Saturday, March 04, 2006 6:51 PM
Subject: Re: [sdiy] MIDI to CV question - no Triggers?


> Hi Carsten,
>
> Yes, I guess the problem is: What happens when you are holding one note 
> and
> then press down a second note without letting the first one up?
>
> In an 'old fashioned' analog keyboard, the sample and hold would update to
> the new note value (usually only if it were a lower note, IE low note
> priority) but also there would be a trigger pulse appearing at the 
> "Trigger"
> output.  The gate, however,  would remain high (because the first key was
> still being held down).  So my question is, how does this type of sequence
> of events typically get interpreted from the MIDI data stream in most
> MIDI-to-CV converters that only have "Gate outputs"?
>
> In these types of converters, does the "Gate" output toggle down and then
> back up for a very brief moment when a second key is pressed, simulating a
> "Trigger" action, or does it simple ignore the second key-down altogether
> (other than the change in CV of course).
>
> In an analog keyboard, the "Gate" ouput would stay high in this sequence 
> of
> events, so I'm not sure what you meant by "build a simple monoflop to get 
> a
> trigger pulse from a gate out".  Could you clarify?
>
> thanks,
>
> Dave