I had a Doom 2 HGM for a while, but I ultimately preferred the standard version. The Doom 2 HGM is exactly what it sounds like: the same fundamental sound(s) as the standard Doom 2, but way more gain. Spencer says it's 10 times as much and I can believe it. Apparently the midrange crossover is slightly modded as well (something these new Doom 2 will now have as well). It's subtle. And the treble range is expanded. I can definitely hear that. What's really nice is it's not hard to dial in or tame like some fuzzes.
Because of the extended gain, it can do the normal low-gain bass synth of the standard Doom 2 and also serve as a ripping fuzz in a way the standard Doom 2 cannot. The caveat is that because the range is so much wider, it takes a little more accuracy with the gain knob to dial in those low-gain sounds: the same knob-twist on the HGM is going to have a larger effect than on the standard Doom 2. So if you only use it for low-gain synth sounds, then I'd say either version will serve you just fine (and the standard might be slightly easier to work with). But if you want it for high-gain synth or aggressive fuzz as well as the low-gain synth it's so known for, then the HGM is where it's at.
