Electro-Harmonix EHX Nano Doctor Q Envelope Filter

Electro Harmonix EHX Nano Doctor Q Envelope Filter in good condition. All working as it should. 
 
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 specialises in generating percussive punchy filter sweeps for a rhythmic groove.