Detlof,
I don't doubt you heard what you claim you heard. But, it still is important to have some idea as to why you got that particular sonic result.
It is possible for a scoundrel to put out something that modifies the signal using common circuit elements, such as resistors or capacitors, etc. Some listeners would hear a positive result, because that was what that system needed for that particular listener's taste, but in most systems the result would be a negative or no change. If it helps, then it is worth having, but, if that result could have been reached with $.50 worth or components, instead of many thousands of dollars, that is a rip off.
With respect to the Bybee stuff, I plan to hear for myself, even if the description of how it works sounds extremely dubious. But, I would like to know if anyone has explored its basic electrical properties (i.e., not its claimed quantum physics effects).
I once had a friend who distributes audio gear demonstrate a powerline conditioner that plugs into any available wall socket. He got it on a trial basis had knew nothing about how it worked. We all could easily hear that it had a positive effect on the sound. He asked me how I though it worked. I speculated the following: when the switch was put in the "on" position and the LED was lit, it was actually out of the circuit and doing nothing; when the switch was in the "off" position, it was actually on and putting out interference to screw up the sound and give the impression that the "on" position was a big improvement. He thought that was pretty funny, but, as for me, absent any plausible alternative explanation, mine was a pretty reasonable guess.
