playing guitar through the MS-20 patchpanel

[graveyardward]

Hi , new member here . I used to own one of the first MS-20's . I'm a guitarist but I bought the Korg to play through the external signal processor . At the time we had a keyboardplayer in the band who knew a lot about patchpanels and how to effectively use them . He made a patch for me where I could plug in a volume pedal (in and out) and use that to control the filtersection . It delivered the most crazy wah-sounds . But how it goes : a few years later the band split up , I sold the MS-20 and lost all contact with the keyboardplayer . Since a few months I'm the proud owner of an old but mint MS-20 again , but I can't find back the way we patched up the pedal to get this filter control . Could anybody in the forum help me on my way with this ? It's been 40 years since the last time I used it and I forgot completely how we did that back then .