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I've never A/B'd any of that sort of stuff but my guess would be people arguing over changes in sound due to caps in the signal path. I've heard it stated that large voltage film caps sound "better" than smaller voltage ones for input/output/etc. caps. Large voltage film caps are not tiny things, and if they have managed to make smt versions of those, I'm sure they're very different in composition indeed. I think the only way anyone could truly say one way or the other is to breadboard something with smt caps and regular large film caps set up to be switched back and forth between the two. My guess is few have actually done that and are going by theory alone. I've heard the guys who use theory alone say that different types of transistors don't sound different in a Muff if they have the same gain; I have personally tried 7 different types, measuring the gain of each and can tell you that there is a world of difference between the sound of one built with a 2n5088 transistor and others of the same gain. I'm not an EE, but I could absolutely hear a difference (and was actually one who thought it was all BS to start with) and in the end that trumps anything you'll find on paper.
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