Unleash the funk with the Electro-Harmonix Q-Tron+ Envelope Filter—an advanced envelope-controlled filter pedal designed for expressive, dynamic tone shaping. Known for its iconic “quack,” the Q-Tron+ reacts to your playing intensity to produce everything from tight percussive pops to smooth, vowel-like sweeps.

This pre-owned unit is fully functional and includes the required 24V DC power supply. (Note: Images are for reference—actual appearance may vary.)

• Built-In FX Loop: Insert pedals inside the filter path while keeping the envelope detector independent.
• Attack Response Switch: FAST for tight funk; SLOW for smoother, vocal-style filter action.
• Multiple Filter Modes: Low-Pass, Band-Pass, High-Pass, Mixed.
• Sweep Range Switch: Hi/Lo for tonal emphasis changes.
• Peak Control: Adjust filter resonance from subtle to extreme.
• Sweep Direction: Choose UP or DOWN for rising or reverse sweeps.
• Boost Switch: Adds output gain and enhances responsiveness.
• Power Supply Included: Comes with the required 24V DC adapter.
• Rugged Build: Die-cast chassis with True Bypass switching.

• Condition: Pre-Owned (Fully Functional)
• Power: 24V DC Adapter Included
• Bypass: True Bypass
• Use Case: Funk, Rock, Experimental, Electronic, Bass/Guitar

The Q-Tron+ remains one of the most expressive and musical envelope filters ever made—perfect for players seeking vintage funk tones or modern sound design flexibility.