I built a McMeat two years ago. A monster of a filter! Very pleased with the results.
I also did some mod's but I don't remember exactly how they was done, one made the "Color" control much more responsive along the way. The other was about to add the Tremulus Lune LFO to the center frequency of the filter, kind of cycling wahwah.
I didn't use the proper already made optocouplers, so I did them with LED + LDR covered with some thermo-retractil tube.
The looping chain is a very useful thing too as you can use some dynamics-killing effect (like a fuzz or a compressor) and the McMeat envelope detector will follow the unprocessed signal envelope.
I think there was an error or two on Pisotones site regarding one rotary switch wiring and a resistor that was forgotten in the detection section. aside this, it's a marvellous tutorial.
For this message the author Alex Frias has received thanks:
I think I'm going to use toggle switches instead of the Lovetone's rotaries. (Got the idea here: http://www.martoneaudio.com/meatwad.htm) Anyone know what type to get? I know there are 2 with 3 positions and 2 with 2 positions, I just don't know if I need SP3T & SPDT or what. Also, one of the build reports I saw had some caps across some of the poles of the range knob, wasn't sure if I was seeing that correctly or how to apply that to a toggle switch. Said picture is here: http://www.pisotones.com/Meatball/psst/ ... edium.jpeg