Snow White Autowah (GB) is suitable for both guitar and bass and is tuned like a real wah.
"The Mad Professor Snow White is hands down the best sounding auto-wah pedal on the market today.
The reason that guitarists love the sound of the Mad Professor auto-wah is that it comes the closest to replicating the sound of a manual wah pedal. While the controls are nothing special – you’ll find sensitivity, decay, resonance, and range (bias) controls – the responsiveness is impressive, and it’s much easier to create unique wah effects without over-saturating your tones.
Another advantage of this auto-wah is that it works for bass as well as guitar. For bass players in search of an auto-wah, this is easily one of the best units available, and all it takes to activate for bass is the flip of a switch.
Of course, the pedal is built with analog circuitry so that you have a true bypass without electronic interference when the wah effect is deactivated. The circuitry and pedal as a whole are protected by Mad Professor’s two-year warranty."