I have a vintage Taiwanese one from the 1980s. Not sure what year exactly. It's a very different pedal from the HM-2, I think. It sounds much more contemporary. It's a very harsh and mid-rangey pedal (for lack of a better description). The HM-2 has a lot overwhelming low-end by comparison. I think the HM-3 fixes a lot of problems that the HM-2 had, when it comes to having a more even level between low mid and high frequency. HM-3 is more usable for chords, strumming and soloing. Would keep this one if I had to choose between HM-2 and HM-3.