- 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.
- (2009-02-22) Doctor Q - Demo by Dave Weiner - Envelope Filter by Electro-Harmonix
- (2010-02-07) Electro-Harmonix - Doctor Q - Demo by Dave Weiner - Envelope Filter by JRRSHOP02
- (2012-04-16) EHX Doctor Q Nano in 100 Seconds by docSanchezFX
- (2012-08-09) Electro Harmonix Nano Doctor Q Envelope Filter Guitar Effects Pedal by Gear4music
- (2012-11-20) Electro Harmonix Nano Dr Q Funk Effects Pedal at Sam Ash Music by Sam Ash
- (2013-01-06) Electro Harmonix Dr. Q Demo by mrtolex
- (2013-02-12) EHX Doctor Q Nano Pedal Demo - Bass - Envelope Follower by TheJRGuitars
- (2013-02-13) EHX Doctor Q Nano Pedal Demo - Guitar - Envelope Follower by TheJRGuitars
- (2015-01-01) Electro Harmonix Doctor Q Review & Demo by mickeysmusicalreview