My assumption is that the answer is "it won't matter, you aren't going to hear a difference either way" but is it best to leave the pregain enabled or disabled on the EVAL1? I can reach acceptable volume levels in either configuration, but even after reading through Amir's reviews I am unclear whether there is any real gain (sorry) to disabling it for the average "look I can assemble a Ghent case" DIYer such as myself.