[sdiy] Simple AR tips

[synth at oldmail.charlielamm.com]

I have built the morphlag, and it is simple and extremely useful.  Highly 
recommended.

As far as velocity from your AR, try this patch:

Set up your MIDI to CV to output CV that follows velocity for the current 
note played on your controller.  In other words, faster note strike = 
higher CV.

Plug the output of this into the CV input of one of the "mod inputs"  of
the VCA's you got from me (the "Irwin" linear VCA from my site), or any
linear VCA that can attenuate CV.

Plug your AR out to the "audio" input of the VCA

Plug the Out of the VCA into the circuit you are controlling as mod CV
(filter, VCA, any device that accepts CV)....If you are using the Irwin
VCA "stock" you will need to invert the output of the VCA.  This is
accomplished via a simple 3 resistor, one op amp inverter, or you can use
the inverter in the morphlag if you've built one. Email me offline if you
need the inverter schematic but I have a feeling you already know how to
make one.

Now, if you play "faster", a larger AR signal will be presented to your 
module.

--CL


On Sat, 18 Sep 2004, Peng wrote:

> Thanks for the tips. I'll investigate the diode compensation and report back later. But this looks like what I'm lookin' for:
> Harry Bissell's MorphLag circuit http://www.wiseguysynth.com/larry/schematics/Morph-Lag.htm
> 
>  
> 
> Thanks,
> 
> P.
> 
> 
> Ian Fritz <ijfritz at earthlink.net> wrote:
> 
> 
> You didn't give us a link to the schematic, but it sounds like you are 
> seeing a common symptom of simple EGs. As the envelope decays towards 
> zero, the resistance of the switching diode becomes large, increasing the 
> RC time constant. I also find those tails highly annoying. There are 
> simple circuits available for compensating for the diode drops. I like 
> these better than just truncating the response, which I believe is what you 
> are describing.
> 
> Ian
> 
> 
> 
> 
> > I've just started experimenting with the AR so if anyone has any 
> > opinions or suggestions or tips, please let them flow. Such as capacitor 
> > types ( found that polyester SEEMS quicker than the specified 
> > electrolytic ). I would like to tweak the response curves but not sure 
> > how to approach it.
> > Any techniques for employing velocity in patches would be very 
> > interesting to hear about.
> >
> >Thanks,
> >P.
> >
> >
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> 
> 
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