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Excellent thanks for the advice. 

I'v put the 4uf nonpolarized one in now, and since there was space put a 100n cap in parallel, so its bang on.

I need to pick up a trimmer pot for the peak and I'm done.  Will hopefully test it later.

Many thanks WW

Hi- I'm new to the forum but have built a few pedals so far.

I'm currently finishing a Weener Wah, which I'v built as per the schematic. 

I'v found it quite difficult to find a 4uf electrolytic cap.  I found some old panasonic ones but they had drifted over 6uf.  I have an old German Ero MKT which measures almost 4uf  (3.91), but isnt polarised.  Does anyone know if non-polarised would be a problem? 

Also is it worth putting a 100n in parallel since there's space?

Thanks for any advice

C