Just drilled the hole for the Tri Gain switch on my MT2 sustainiac mod, and finally had a chance to test it out.
These things sound great.
Props to Monte Allums, if anyone reading this is thinking about it - Stop thinking, and order!
The Sustainiac is great, and combined with the tri gain switch, you can actually create quite a few sounds - Through the LEDs it sounds tight, and through the diodes it sounds very dark and high gain - I'd say that the diodes are closest to the original MT2 sound, but at a much thicker, and clearer tone.
Only issue I have is that different settings on the Tri gain switch are at different levels, now I know this sounds obvious, since it's 3 different gain levels, but when put through the diodes it sounds alot quieter volume-wise than through the LEDs or bypassed - But I'm going to relook at my soldering, because I think there must be an error somewhere there.
Overall the pedal sounds better in everyway - clearer, quieter, more definition, more tone. The pedal now has mroe top end, the mids aren't so dominant, although the lows still sound great on the Diode and bypass modes. There's also much less gain - If you want a better quality MT2 then go for the other mod, the sustainiac definetly reduces the amount of the gain the thing has - albeit not by much - in order to improve the versatility of the pedal, I'd say that this could be used as an OD, which the original MT2 had far too much gain for on any setting.
I also did my Monte Allums CS3 Opto Plus mod on Friday, and that too is flawless, very quiet, barely sucks any tone, and sustains brilliantly - everything you want from a sustainer.