VCAMatrix quadrature patch with PEG

YouTube Uploaded by 4mspedals on Jan 5, 2012

"In this demo, we show how to setup a quadrature panning patch with a 4ms VCA Matrix, and two 4ms Pingable Envelope Generators on a Eurorack synthesizer.

Four oscillators are used for the A,B,C,D inputs on the VCA Matrix. They are being mixed on output 3 of the VCAM. The four corresponding CV points for A,B,C,D, are hooked up to the four Envelope outs of two Pingable Envelope Generators.
Halfway through an envelope's duration, the next envelope is triggered. (watch the button LEDs on the VCA Matrix). Thus creating quadrature panning.

To create 4 CV sources 90º out of phase, first enable Half-Rise trigger output in System Mode for all four channels of the 2 PEGs (see manual). Send the same clock signal to the four Ping inputs, with all divisions set to the same amount and skew set to center. Now, take the Half Rise Trigger output of the red channel of the first PEG, and plug it into the Async trigger input on the second channel of the first PEG. Continue the chain by plugging the blue channel Half Rise trigger output of the first PEG, into your second PEG's red channel Async trigger input, and repeat the same for the final blue channel of your second PEG, but now plug the last Half Rise output trigger (blue channel of 2nd PEG) back into the red channel's Async trigger input of the first PEG. Your two PEGs are now in a trigger loop.

Start up the first envelope by pressing any Cycle button on. This will start the next envelope once a Half Rise trigger has been sent to the next channel, and so on. But now that we have the last channel of the second PEG looped back into the first channel, we can turn off cycle, as it was used to just start the trigger loop. Use the ENV outs of the two PEGs, and voila, now you have four 90º out of phase CV signals that can be used for quadrature panning!

Once this is set up, you can tweak the PEG to your heart's content. If skew is set to center and Half-Rise is triggering the next channel's Async jack, then every envelope will start half-way through the rise of the previous envelope. Moving the skew knob around will create larger or smaller gaps in-between the envelopes. Changing the Curve knob will give you different envelope shapes.
You can also use EOR or EOF to trigger your chain of envelopes instead of Half Rise. End of Rise will give you greater spacing in between the different envelopes, effectively waiting twice as long to trigger the next envelope as using half rise would yield (assuming Skew is set to center). End of Fall can also be used for an even greater spacing between triggering (four times long if Skew is set to center)."