Had a fine Magellan moment: plugged straight in to the AC15C1 yesterday for a glorious time-don't-matter session. Fiddled with the dials as never before. Found that with the guitar plugged into the Top Boost (vol. about halfway), if I turned the Normal volume all the way up, the TB sounded sweeter and smoother than with the Normal vol. halfway up or, as I had been playing it for years, all the way down. It seemed particularly touch-sensitive this way, too. Really lovely. Just curious why this is so. How, electro-guts-wise, do the TB and Normal channels (right term?) interact to cause this?