Morley wha schematic

[fuzzo]

Hi,

I need some advices about this schematic :

http://www.morleypedals.com/pwa.pdf

I would like to do one. But I'll use a 100Klin pot instead of LRD . I need to put some resitor to limite the curve ?

Some poeple say the sound is too bassy with 6n8, What value I can put ? I need to incorporate a switch in this circuit (I've already drilled the box) and I thought I could add a cap in // with one (or both) cap in feedback loop  to have another Wha range  (as mike matthews's soulkiss) but ,again , I don't know what values I can add.

So, I need your help.