This was at Rocky Mountain a number of year ago. They had a decent system w Raidho D3's as I recall with a Burmester CD player and integrated amp. . He insisted that changing just one interconnect between CD and amp could make huge differences (if it was a Nordost cable, naturally). Each time he changed cables, going progressively up the line, he changed CDs! The audience never got to hear the same CD or track with different cables. At the end, after he finally put in a Valhalla cable and praised its obvious virtues. People were nodding their heads like lemmings. I asked if he could keep the same song and go back to his first cable or in fact, any other Nordost cable. He refused. Hemmed and hawed, babbled something idiotic and never gave a cogent reason. A complete charlatan. The most fraudulent demo I have ever seen in public. Too bad because Valhalla cables are actually pretty good and in fact I owned them at the time!
I do not want to start a debate but what you are referring is simply not true! I've had the chance to partecipate to several of the Lars demo during the shows in Guangzhou as well as in my shop in Shanghai and I never see something like you are saying happening. Yes, he was changing the track but not in the way you are telling! Cable A track 1, Cable B track 1, then change track and try Cable B vs Cable C and so on. This in order to avoid a boring comparison using just one single track.
I have no personal interest as I'm not selling Nordost or Raidho anymore since long time ago, I just want to share my experience that is different from yours.
Cheers