i guess the part of their schem i need is the part on the attached file,
i guess the pot is for trimming the voltage divider,
do I need the cap marked in the red circle?
and will this circuit sort out the neg voltge problems?
will tone length be affected?
I assume (peerhaps erroneosly) that if i effectivly clip the negative parts of a waveform that the length of the ave may be changed?