[sdiy] Speaking of Wah designs, Mr Multi

Sean Ellis tensiontype at hotmail.com
Wed Jun 19 08:19:46 CEST 2024


I recently discovered the Mr Multi pedal from Korg and I think it's a fascinating circuit. It seems to use the first 2 stages of the phasor as a bandpass and the rest as a sort of all-pass, the bandpass apparently does a great job of being a wah even though it's really not.

The switching logic is quite interesting where it injects the signal, has anyone heard one in person? The demos of the dual peak mode are really interesting and there's a clone PCB available which is tempting.

Clone build docs with schematic:
https://www.deadendfx.com/build-doc-links
[https://assets.bigcartel.com/account_images/1329529/24899778_2005493143063828_2451984945816009762_n.jpg?auto=format&fit=max&h=1200&w=1200]<https://www.deadendfx.com/build-doc-links>
Build documents<https://www.deadendfx.com/build-doc-links>
NOTE: Due to input from our builders, as well as our own build experiences, these build documents are subject to change at any moment. Updated...
www.deadendfx.com


https://www.youtube.com/watch?v=Xk06gB0H0Fo
[https://www.bing.com/th?id=OVP.G46lyryXPwAlGGdhBd7skgHgFo&pid=Api]<https://www.youtube.com/watch?v=Xk06gB0H0Fo>
KORG Mr. Multi - Analog Filter Pedal 1975 | HQ DEMO<https://www.youtube.com/watch?v=Xk06gB0H0Fo>
(c) 2011 by AnalogAudio1 The Korg Mr. Multi is a FX pedal from the seventies. It has a sort of highpass/lowpass filter similar to the "traveler" filter of early Korg synthesizers, like Mini Korg 700(S), Korg 800 DV, Korg 770... It also sounds a bit like resonators found in the Korg PS-3100 polyphonic synthesizer.
www.youtube.com

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