[sdiy] How long should a Trigger pulse be?

[Tom Wiltshire]

Yeah, that sounds like exactly what I was afraid of. If you use a longish trigger pulse, the gates will be delayed by that amount.

Interesting that they've bothered to avoid the effect for non-legato notes. It hadn't occurred to me, but it's an obvious improvement to make - it at least limits the problem to only *some* not *all* of the notes.

Thanks,
Tom

On 19 Dec 2013, at 19:26, dancemachine <dancemachine at gmail.com> wrote:

> of note, the phil rees midi to CV unit that I have has this re-trigger function and it introduces a noticeable delay to notes played legato and isn't fun at all when used that way.  I don't know what the cycle time is though.  the model is the little MCV, which I got for cheap so I'm not complaining, but figured a reference for what isn't acceptable might help.  Not sure if I have a facility to measure the times on hand though....
> 
> 
> On Wed, Dec 18, 2013 at 9:38 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
> Hi All,
> 
> I'd like the benefit of your combined experience, if I may.
> 
> I'm decoding MIDI Note On/Offs and outputting Gate and Trigger pulses to drive envelopes. My own envelope designs don't need a very long trigger pulse in order to fire, but I thought perhaps some others do.
> 
> Currently I'm using 500us Triggers, but I don't have a big pile of old synths here to try that on, so I don't know how well that will work on vintage gear.
> 
> And then of course, there's the problem of envelopes or synths that don't have a Trigger input...
> I remember the Kenton Pro-2 MIDI-to-CV convertor had a "retrigger" mode where it dropped the Gate briefly to allow Gate-only envelopes or synths to retrigger. It didn't say how long it dropped the gate for though. I'd thought to do something similar with the following circuit:
> 
> http://www.electricdruid.net/GateAndTriggerCircuit.png
> 
> This converts Gate and Trigger into a Gate-with-gaps that will retrigger a Gate-only envelope. And this is the main reason for my asking the question; In this case, the output gate is essentially delayed by the length of the trigger pulse, hence my desire to keep it as short as possible. If it wasn't for that, I'd just use 5ms and reckon that'd trigger anything.
> 
> So, oh wise ones of Synth DIY, how short can my trigger pulse be?
> 
> Thanks,
> Tom
> 
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