PAiA MIDICV8

[Grant Richter]

>Question for someone.  It seems that they have put an open collector
>transistor on each output in addition to the buffered CV output.  They call
>it an S-Trig (I think that is what Moog used), but it requires a pullup
>resistor to work:
>
The "S" trigger stands for "Switch" and comes from Vladamir Ussachevshy's insistance that
a simple switch closure be the trigger/gate standard. The logic of the signal is reversed, the 'S' trigger
goes low on Gate high. The pullup resistor is built into the interface in the synth
you are connecting to. The polarity can be a problem. Moog Sources go from -5V
to ground for a trigger.

>
>Does any one have an idea of how to make this S-Trig Output into a useable
>gate and trigger output?  Their four voice mode does not provide a trigger
>output, only CV and Gate.
>
The rising edge of the gate pulse can be differentiated by a 0.001uF capacitor.
Most modular envelope generators have this function normaled through to the gate input.
Most envelope trigger inputs already use a cap to couple the gate to
the trigger input if a seperate cord is not plugged into the trigger in.

>So far, the only mod I've made is to replace the single turn CV Trimmer with
>a 15 turn to make it easier & more accurate to adjust.
>

If you have problems with the AD phase of the ADSR try running the gate signal
into the trigger input also. If thats funky, add a 0.001uF cap in series with the gate
signal to derive a trigger.