The MXR M82 Envelope Filter is an effects pedal that provides a wide range of tones for bass. - Brand: MXR - Model Name: M82 - Type: Envelope Filter - Controls: DRY, FX, DECAY, Q, SENS, OUTPUT, INPUT - Accessories: Instruction manual, box Thank you for viewing. This is the famous MXR M82. It's a classic in the bass filter world. It comes complete with the original box and a simple manual. Please understand that shipping may be delayed by 1-2 days due to work commitments.