The first one I did, was on the Plan B Model 12 Rev.1 State Variable Vactrol Filter.
It really is a very simple mod consisting of a simple ON/OFF switch and a 330 Ohm, 1/4W, 5% resistor.
This mod is intended to add a switchable overdrive to the filter, it gives it more gnarl, more grit, more grain and presence.
The perfect place for the switch is to have it in a 90° angle between the frequency knob and the bandwith knob, like this :
5) Reverb <> filter position switch : not installed yet...I decided to do this mod at some later point... just installed a switch to fill the hole (no red cap on that switch) :-)
6) Internal feedback pot : same implementation as described on the "official" Moisturizer mod page.
These simple mods produce amazing sounds, ranging from earth shaking subsonic warbbles, to rich living drones, pulsating squelches, supersonic tchirps, analog clicks & cuts, sheer noise, other worldly transmissions, psychedelic acid drops, sizzling FM, percussive mayhem, ear piercing feedbacks, subtle harmonic sweeps... you name it. The Moisturizer is pure analogue magic and really is one of a kind. Every producer of "serious" electronic music should have one of these... it begs for being used and abused.
Gosh, I love this thing ... I could spend hours and hours tweaking the knobs and still discover new sounds, each knob turn opening a whole new world, full of sweet spots ! Thanks Karl, for this heavenly gift :-)
Watch my Soundcloud page for sounds !