From Gremlin Machine Shop:
If you are a HM-2 collector then this will be an ultra rarity built with extremely high quality for the price, and lifetime warranty.
FEATURES : Built closely (but not exactly) to original specs and components, has a few updates to my choice of specs including op amps, diodes, Mids & High pot values/tapers, and the Gain knob range (tighter). This is fully intended for overdriving a dirty amp channel into chainsaw mode.
Added the "Mids Assign" toggle switch to re-couple the MIDS control back to the HIGH knob like the original Boss unit. Cool feature for having a secondary scooped tone dialed and ready with a flip. Or just to be sure you are in a mode.to.replicate the stock configuration.
There are additionally two internal dipswitches for changing the diode configurations but it is not recommended to mess with them.