Mark DeBellis wrote:
OK but I am saying, suppose the meaningful variable is a property of
an extended passage. So you have to listen to an uninterrupted
passage in order to perceive the property. Switching back and forth
will defeat the purpose, yes?

Yeah, but. First, the problem, if it were a problem, could easily be
solved by listening to longer passages. No one's ever heard differences
between competent amps/cables doing it that way, either.

Second, the research demonstrates pretty clearly that our memory for
subtle sonic differences is very limited. In other words, contrary to
your conjecture, switching back and forth quickly and frequently really
is more effective.

bob