https://youtu.be/-un38-bc4bE Product Information: Same design as the original EHX Q-Tron but with extremely useful Effects Loop and an Attack Response Switch. The Effects Loop gives the musician the ability to place an additional effect, or chain of effects between the EHX Q-Tron Plus’s preamp and filter section without changing the envelope drive. This is particularly important with most distortion devices, as most all do not have much of an amplitude envelope. Product Features: Pedal type: Envelope Controlled Filter 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 For more information and specifications, please refer to the manufacturer’s website