I moded my neighbours Casio guitar, which was once part synthesiser guitar till someone knocked his coffee over onto the electronics. The synth was then pulled out and conventional pots put in. 250k was used and the humbucker (its a h,s,s strat type setup) sounded like mud. I then tried both a 500k and then a 1Meg with the 1Meg winning.
My neighbour then bought a Godin ,when he was in the USA in December and his wife made him give the Casio to me. I was showing him one of our Afri-cans last week and her comment was "Andrew you have enough guitars"
Keith