This is so disappointing. Can you guys not agree to doing the test without the switcher? Although I agree with the short term audio memory, I also think if you listen to one relatively short sequence of a movie scene, you can engrain the nuances and sounds into your brain for long enough. Just don't complicate it with a test with three, 5 minute scenes and 3 musical sequences. Keep it simple.
For example, I have 2 specific scene in transformers movies that have a good variety of detail and differences from quiet sounds to loud bursts with rocks crumbling all around. I use this sequence whenever I try new gear. I am so familiar with it, that when i hear something new in my system, I believe I am able to detect differences. Whether I like the change or not. In the past I have noticed new sounds I haven't heard before. Extra pieces of rocks breaking off and crumbling. A wind passing by. The location of the effects have also improved. And when a component has broken down, like my main amp and I've replaced it with my back-up amp, I notice the loss in some of those sounds. And more so in this case, the sounds are overall more similar ad brighter.
Point is, I think some of us have enough sound memory to last long enough to switch the cables and restart as long as it's kept simple. (I say some of us, because I think like vision and other forms of memory, people vary in their abilities. Some may have damaged their ears and can't hear certain sounds, or may simply not have the capacity to remember sounds as well as another).
Although I don't believe there will be a night and day difference, (as that's for comparing HT's in a box to a 10 grand+ system) I do think there should be enough detectable subtleties that would satisfy those of us audiophiles searching for improvement in that 95-100% range.
If a person can't spot subtleties in a short scene he is vehemently familiar with that he has listened to over and over again in the same room under the same conditions, (no furniture moved, no new people standing there, same listening position, same components), then either the component or cable, whatever, either has no difference or that person shouldn't be spending money on differences as they have the inability to detect them. Btw, I would suggest you both should listen to the same scene on the non modded unit sitting in the same positions in the one room together a number of times first. Maybe 5 times. Perhaps discuss some of the sounds and things you hear. Then try the modded unit. Try the modded unit maybe 2 more times. Then go back to the non modded unit. That's how I test new gear and decide whether to keep it.
Perhaps to appease yourself Pepar, also do the test with the switcher. Do it both ways. See what happens. Understanding the basic logic of modding the component to use parts than reduce noise interference to achieve better sound, I can agree with the concept of not adding in the switcher if Nature he has tried it and feels it's addition affects the sound. Although it seems logical that it would affect the sound of both units, it may not be so noticeable to the non modded unit, but in that high percentage os noise reduction region that seems hardest to achieve, maybe it would be more noticeable. I don't know. Haven't tried it on these units so I can't say. But I could agree with the possibility. So I suggest doing it both ways.
But in the end, these changes are compared to the best of the best processors. So I think, under above said conditions, you guys should at least be able to detect some form of improvement in subtleties and nuances. Willing? Able?