Which Cap is Best?

[soupbone]

I'm a little unsure what this cap is doing in a wah circuit,and the different values that were used over the years.So,I have a '68 Crybaby Made in Italy,That has a 4uf Cap.I also have a '74 Thomas Organ Co. Crybaby that has a 3.9uf Orange Tantalum Cap,and a newer Dunlop Crybaby that has the most common Electrolytic 4.7uf Cap.I'm just clueless to what exactly that cap is doing in the circuit?!I'm going for a "Vintage" Wah Tone with my Dunlop.(Because I'm too scared to bring the old ones out to gigs.)  I'm just wondering if I swap in a 4uf Cap(which i have) If that's going to do anything audibly?

[duck_arse]

here is a page:

http://www.geofex.com/Article_Folders/wahpedl/wahped.htm

it contains all the answers to your wah questions, at least until joe gagan comes by.

[soupbone]

here is a page:

http://www.geofex.com/Article_Folders/wahpedl/wahped.htm

it contains all the answers to your wah questions, at least until joe gagan comes by.

Good ol' R.G. Keen!I've read some of it before,but I didn't read all of it.I'll give it a good read through.Thanks!