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Modulated Self​-​oscillation / Feedback

from Pittsburgh Modular INOUT by Matttech Modular Demos

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This all gets pretty complicated, so bear with me!

With the Pittsburgh INOUT module you can either use it as an interface between your modular and effects pedals, or you can send modular signals into it, and then amplify them to oblivion internally using the provided amplifier (which is intended to boost the pedal effect returns back up to modular levels).

You can then mult this output back into the 2nd input and create screaming feedback, a la Pittsburgh Filter in OSC mode. Sweet! The two controls on the INOUT then control the pitch of the self-oscillating square wave produced by the feedback.

I then got the idea to try to manipulate when this screaming was taking place, along with its pitch, by sending the multed output via a modulated VCA (swept in and out by Maths). The screaming now only happens when Maths is triggered by one of the a149-2's random gates. as that Maths envelope finishes it triggers a 2nd Maths env (by taking the EOC gate output into the trigger of the 2nd Maths). This 2nd Maths envelope sweeps in a load of ever-changing envelopes from the PEG, that are also sent to control the amount of multed output that is fed back into the INOUT. So.....the screaming sweeps in, and is then followed by a series of little bursts as the PEG takes over. The pitch also modulates as it is sweeping in and out.

The sound source is the Piston Honda, which is sweeping through waveforms, controlled by the Vulcan Modulator (on slow sine) and the Doepfer a149-1 random module. The a149-1's output is multed via another Maths (to add slew) and sent to the 1v/oct input of the Piston Honda, along with the Hither wavetable CV input. The Piston Honda's output is also multed into the Plague Bearer, and then used to FM itself via a VCA that is opened and closed by one of the Maths envs. The Plague Bearer's LOW cv input is modulated by the a149-1. It basically destroys the Piston Honda's sound even more. Like it needed that....

The star of the show is definitely the INOUT, and - even when not feeding back (ie: when the VCA is closed) it is adding a lovely overdrive to proceedings.

The a149-1 (lower section, that is feeding the destinations mentioned above) is clocked from one of the random gate outs of its partner, the a149-2. The slew on Maths is also modulated by the same envelope that is FMing the Piston Honda, creating much longer pitch bends at various points.

Various jamming takes place.

It's not a work of art by any means, but it was fun....if a little self-indulgent!

credits

from Pittsburgh Modular INOUT, released June 13, 2013

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Matttech Modular Demos Manchester, UK

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