Sounds excellent. Still has Velcro on the bottom for pedalboard installation. Immaculate condition except one of the knobs fell off and I can't find it anywhere. I am sure that MXR could provide a replacement for very little cost. Ships in original box. Analog envelope filter True Bypass 9-volt operation Bring on the funk! The MXR Bass Envelope Filter gives you classic analog envelope filter sounds in a pedalboard-friendly pedal. You can dial in the perfect amount of filtering thanks to Dry and Effect controls - very helpful for preserving the low end. Dial in the right amount of sensitivity for your level of attack and you're off and running! Plus, the Bass Envelope Filter boasts true bypass, so when you bypass the pedal your tone stays intact. It's time to get funky with the Bass Envelope Filter!