hi,
i've finally made an external for reproducing a real wah-wah effect.
the algorithm was borrowed ( with kind permission ) from Digital Effects, a DOS guitar effects software that rocks !!
Guitar Effects is a kind of Open Source project written by Alexei Smoli and is available @ http://st.karelia.ru/~smlalx/ it contains a lot of effects so some other externals can be done for PD.
cheers,
yvotchka unauthorized PD http://ydegoyon.free.fr