Fortunately these are DIY mods, and not actual circuit bends."The mods consist of:
Filter Overdrive – This knob drives the VCO or external audio source into the filter stage causing the VCF to overdrive and distort. The knob is wired with the maximum drive as fully counter-clockwise and the clean sound filly clockwise. In this respect it could be called a Filter Cleaning control but it is wired this way to give the best response curve to the control. This control will boost the output of the 101 a huge amount so be careful.
PWM waveform source – Normally with the PWM set to LFO modulation you only have the option of using the triangle waveform as a modulation source. This rotary switch allows you to set the PWM modulation source to other waveforms independently of the main LFO setting. The options are Triangle, Square, Random, Noise, Sub-1 and Sub-2. The Sub waveforms are actually sourced from the VCO. Changing the setting of the sub octave switch will alter the sound with these sources.
VCF CV input – This jack socket on the top left of the case will accept an external voltage to control the filter cutoff. The suggested input is 0-5V but it can probably take a couple more volts if your Midi-CV converter can deliver them" and more.
via Dustin
I have some little sets for this kind of mods...it was known as "novamod" in different versions a few years ago. Oh and Technology Transplant sells some replacement parts once in a few weeks...sliders, pitch benders, pots etc. - good stuff.
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