I just finished up some intense custom mods on this Moog Werkstatt. I packed in a bunch of cool goodies and the case of this little synth is now totally at capacity. It even bulges a little bit, and it feels noticeably heavier. It sounds amazing if I do say so myself.
It’s got a volume knob, a gate input jack (this needs a little transistor circuit in order to work), and separate 1/8″ outputs for the pulse and square waveforms. But the main attraction is a built-in echo module with patchable CV modulation.
The echo circuit is a modified version of the Synthrotek EKO using the PT2399 digital echo processor chip, which is itself a modified version of one of the application circuits from the PT2399 datasheet.
Here’s a little demo video I made. The first half shows the Korg sequencer triggering the envelope generator through the new gate input jack, and then gradually adding echo. The second half shows one of my favorite ways to use it– pushing the echo processor until it starts to feed back and then manipulating the harmonics using the Feedback and Delay Time knobs while the synth plays a PWM drone.
This was a fun project and this synth has now become a whole new creature. Get in touch and I’ll help you dream up some cool mods for your synth!