The Q-Tron Envelope Filter Pedal from Electro-Harmonix is a Q-Tron enhanced envelope controlled filter and is a powerful tool for musical expression. Envelope controlled filters are unique sound modifiers, and the intensity of the effect is controlled by the user's player dynamics. The volume (also known as the envelope) of the musician's notes is used to control a swept filter. As the volume of your notes changes, so does the peak frequency of the filter. The Q-Tron can be used with a wide variety of electronic instruments.
True bypass
Selectable low pass, band pass, and high pass filters
Resonant peak control to adjust the filter's Q from subtle to dramatic
High and low frequency response modes
Adjustable gain knob and boost switch
Sweep direction switch for up or down filter sweeps
Tough and compact die-cast chassis
Overload LED: Lights when the envelope follower reaches its maximum signal amplitude