Detail 01
HI/LO Mode
LO focuses the filter in a lower frequency range; HI emphasizes higher frequencies.

Independent shopping perspective
An all-analog envelope filter with direct three-knob control, HI/LO frequency modes, and true bypass switching.


Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.

Detail 01
LO focuses the filter in a lower frequency range; HI emphasizes higher frequencies.
Detail 02
The footswitch provides true bypass switching.
Detail 03
This is the pedal’s stated current draw.
Final check

Product questions
Straight answers to the questions shoppers most often ask about this product.
Sense adjusts envelope sensitivity and picking-attack response, Attack sets opening speed, and Decay sets how long the filter stays open.
LO focuses the filter lower; HI emphasizes higher frequencies.
Use a 9V battery or a regulated 9VDC center-negative supply with a 5.5 x 2.1 mm plug.
The red, yellow, and blue bugles in the Maestro logo illuminate when the pedal is active.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.