Hi,
i just want to share some piece of free software for live simulating analog electronic audio equipment(mostly tube and transistor simulation). I founded this some time ago.
For every DIY FX maker may be helpful - it is based on SPICE simulation. You can play on guitar live and heat the resulting sound.
@DonPetersen - this may help you to simulating some rare wah's.
Cheers
Damian
http://www.livespice.org/
[Blocked Image: http://www.livespice.org/img/bassmantonestack.png]