- Controls the frequency range in which the filter moves.
- Bass Switch
- Lets low sounds through when it is down, and is especially useful when playing bass guitar or bottom string notes on lead guitar.
The classic 1970's funk box now available in a pocket-sized case. Dynamic picking response produces super-funky wah-like tones. The Doctor Q is an envelope filter that specializes in generating percussive punchy filter sweeps for a rhythmic groove.