Product Overview
From the manufacturer:
Fuzz Dog 7 of Dwarves Auto Wah
An updated and tweaked version of a 90's rackmount auto filter squeezed into a neat little 1590B package.
We won't lie - it's a fiddly beast to work with, requiring some fine tuning of the Bias and Sensitivity controls to get it to work nicely with individual guitars, but the results are worth it when you get the settings nailed. You could see this as either a pain or a blessing, as it means you can get all kinds of responses from it to suit your playing style. It's almost an instrument in itself. Just as good on bass as it is on guitar.
Once the above controls are tweaked, you have lots of scope for adjustment with Resonance and Decay settings. Several hours can easily be lost twiddling with different placing dynamics to explore the huge range of sounds you can get from this thing.
The kit is supplied with vertical-mount pots which have round shafts, so you'll need set-screw fitting knobs.