Pepers' Pedals - Probably the most Heavy Metal HM-2 clone ever. This has two knobs. Level and Blend. Everything else is dimed on internal trimmers. This is my new personal bass pedal.
Boss HM2/Clone Chainsaw Megathread | SevenString.org
Guitar Pedal X - GPX Blog - Boss HM-2 Heavy Metal Pedal Considerations and Alternatives
Boss HM-2 Heavy Metal | Diy guitar pedal, Heavy metal, Guitar