I have my TD-12 set with 4 outs...2 directs and 2 masters. I am recording laying tracks for an album. Direct 1 is Kick, Direct 2 is snare, Master 1 is Toms, Master 2 is Cymbals. Everything outputs separate as it should until I turn on any ambience, or add any snare sound to say the kick or toms. I can back out the snare thing to eliminate the bleedage, but why can't I just add ambience to the snare and/or toms without triggering some sound on the other separated channels? I turn on any ambience and all the channel signals light up like Christmas trees...WHY, even when the signal should be separate?