[sdiy] MIDI to CV question - no Triggers?

[D A F]

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







----- Original Message -----
From: "Carsten Tönsmann" <carsten at analog-monster.de>
To: "D A F" <polaris30 at ncx.com>; "synthdiy" <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, March 04, 2006 8:35 AM
Subject: Re: [sdiy] MIDI to CV question - no Triggers?


>
> Hi Dave,
>
> as I know devices with trigger input really nead a complete pulse cycle to
> react. So if you use it with a gate, the envelope might restart after
> _release_ of the second key, not after _pressing_ it. I would build a
simple
> monoflop to get a trigger pulse from a gate out. That should make your
> device work.
>
> Polyphonic MIDI2CV converter should have a gate out for every parallel
note
> event, so a 4 channel device should have 4 gate outputs. See also
>
> http://www.analog-monster.de/ucvm_en.html
>
> Cheers
>
> Carsten
> --------------------
> Analog-Monster
> Synthesizer-DIY-Project
> http://www.analog-monster.de/
>
>
> ----- Original Message -----
> From: "D A F" <polaris30 at ncx.com>
> To: "synthdiy" <synth-diy at dropmix.xs4all.nl>
> Sent: Saturday, March 04, 2006 6:27 AM
> Subject: [sdiy] MIDI to CV question - no Triggers?
>
>
> >I rarely use MIDI but I am getting a used Yamaha G50 guitar synth
> >controller
> > that has MIDI out.  I want to use it with my analog stuff.
> > I do have an old MTS-100 MIDI to CV kit lying around that I got from
> > Thomas
> > Henry.  It has outputs for CV, Gate, and Trigger.  However, it is only
> > monophonic.  When I was shopping online for a MIDI to CV converter with
> > more
> > outputs, I noticed that none of the ones on the market has "Trigger"
> > outputs
> > (only "Gate", or else a single jack labeled "Gate/Trigger").  What
happens
> > when you use one of these with an old style analog synth that uses
trigger
> > inputs to re-trigger the envelopes?  Does it just drop the gate low for
a
> > brief period and then raise it again when a second key is held down?  Or
> > would you just miss the second key-down altogether?
> >
> > Dave
> >
>