heres my rule: avoid pedals with "metal" in the name
i have an hm-2, and it sucks... no wonder it only cost me 12$... very nasally and smooth... no crunch that i like. Listen to a celtic frost album, thats straight up hm-2 tone. Its fun to put into a lightly overdriven tube amp though... that can get you chainsaw grind a la dismember... i'll post a clip
Personally, for the deth metallzlzz tone, i'd plug a tube screamer into a mesa v-twin... or just use a straight up engl preamp
http://www.soundclick.com/bands/pagemusic.cfm?bandID=686797clip details:
eastwood GP bridge pickup (super 2), tone knob set to 0, volume to 10
--> hm 2 (volume dimed, gain layed off a bit... dont remember EQ)
--> marshall 6100 LM crunch channel, VERY sparing on the amp gain.
--> line 6 spider II cab