I am thinking of building a system not for music reproduction but for music making. The idea is that you have a Mac, a few programs and a sound bank taken from real organs. You link the thing to two midi keyboards and a pedalboard which feed an amplifier and speakers. The amplifier should be powerful, go very deep and strongly so and be superlatively transparent. Of course, all this is very expensive. But I've read something about digital amplification: it seems it is cheap, transparent and very powerful, with splendid bass. I own a Lavardin IT coupled to a Proac panel tweeter pair of speakers (the truncated pyramids) and while this is good for home listening, it would be difficult to do justice to a large reverberating room (say 5 meters high, 6x4). So, suggestions, opinions, everything, please.