"One thing the SH-101 is missing is a CV input to control the filter. I scoured the internet and found several mentions of modifications you can do to add a filter-CV input, but they all involve doing some fairly brutal stuff to your 101. I kept looking at the socket where the modulation grip plugs in. It says "modulation." I thought there must be a way to use it to control the filter, and there is. After experimenting with a kids' electronics kit, I made the little box pictured above. Using this box as an interface you can control the filter cutoff frequency or the oscillator pitch with an external CV. You can even plug in an audio signal and do filter FM or oscillator FM. If you use an external envelope and trigger it only on certain notes, you can acheive and "accent" sound similar to the TB-303 and make some very cool acid lines."
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