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Pinched this idea from freestomboxes.org and its really working for me.  I built the Krankosaurus version 3 and did pauloman's 22n input cap mod which took a lot of the extra bass out. 
The presence mod is simple: Replace R16 with a pot (I used 50k trimpot, some recommend 25k)  In practice the pot works nicely with the tone control to shape the treble detail of the pedal.  I have the trimpot inside mounted on the PCB and have it set to about 17k Ohms...

The result for me is now I set the tone control to 12 O'clock and the Krankosaurus has nicer treble detail, a better match to the bypassed 'clean' sound of my amp.  Basically = Happy Cdog! YMMV
Btw, love to hear from an expert why this works

I built my first pedal... and it was a slambox!
A few dramas and lessons learned... mainly use a drill press!   But its works ok, sounds ok and looks ok.  Thats a win in my book 


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Noobishly I'm asking in the diagram on page 3 showing Switch wiring... are the poles of the 3pdt switches aligned horisontally or vertically?  It labels them ABC/123 but I've only wired 3pdt labelled 'A through I' ala the Wampler pedals book.  Your wisdom gratefully apreciated