I like the sound of High Gain more - feels more powerful to my ears. Kindly keep in mind that my music is often metal, so that plays a role in the my thirst for power and impact. I am extremely sensitive to small vibrations and noise, so if there was any kind of noise added, I wouldn't use HG, but so far it sounds as clean as a summer day with nice weather. I have no idea what that is. I haven't been in this thread for very long, so I actually don't know, but anything that is related to the display wouldn't be fix-able through a complete firmware reflash? Thank you, I wasn't extremely sure where the gain is applied from, and how much of the circuit is the same, or rather, if there is another component that adds the gain, or it is a digital gain controller. The internals of the AMP modules are beautiful actually, I took the libery of opening up AMP 3 to see the beauty that lies within, the capacitors look very high quality!