The Electro Harmonix Q-Tron Plus Envelope Filter w/Effects Loop offers the same design as the original Q-Tron, with added features for increased versatility. The Effects Loop allows for added effects to be placed in between the preamp and filter section without affecting the envelope drive. With the Attack Response Switch, musicians can choose between a slow, vowel-like attack or the original fast response of the Q-Tron. Unleash your creativity with endless combinations in the effects loop.

• True bypass
• Dedicated effects loop allows you to place any effect or pedal board into the loop
• FX send and return without changing the envelope drive
• Selectable low pass, band pass and high pass filters
• Resonant peak control to adjust the filter’s Q from subtle to dramatic
• Response switch changes the reaction time of envelope follower from fast to slow
• Switchable hi or lo frequency sweep ranges
• Adjustable gain knob and boost switch
• Sweep direction switch for up or down filter sweeps
• Power adapter included