Some more Peppermill questions

[mordechai]

I was scrolling through the earlier discussions and saw this thread:

http://www.diystompboxes.com/smfforum/index.php?topic=47870.0

At the bottom of which was a comment that sticking a bypass cap in parallel with the source resistor of the Mosfet would bump up the mids.  I would like to know how this works, and why this wouldn't be the case by upping the cap in parallel wi the source resistor on the Jfet.

Also...I us a 500k pot instead of a 250k for the drive control (no 250 lying around) and it the resulting drive was a little too gainy for me.  Would changing the 100k to ground following the pot to a higher value help with that?