Joannchr With a little help from my friends ….
Alright you got it.
A retired theoretical physicist with the Max Planck Institute for Dynamics and Self-Organization and the University of Göttingen in Germany had too much time on his hands. He was (is) an expert on the physics of synchronization, and a lover of jazz music. So he edited this clip, adding 30ms delay between the piano and the drum. That way it sounded (to him) much more jazzy and swingy. I agree, but my test was not blind, I am a physicist and a geek (in addition to being a lover of jazz music) so I felt my preference could be biased, so I used you guys as guinea pigs.
I think the results are exactly what I thought: people who are lover of jazz and musically very sensitive, like it and may even acoustically aware of what is going on:
HZPiano In any case, based on the better jazzy swing feel alone, "perhaps clip 2".
dore_m I feel like 2 is behind the beat a bit, and I prefer it.
Those who are more classically trained (or simply like more that kind of music) don't:
navindra Definitely 1 for me. 2 feels wrong somehow.
And of course many in-between including those for which 30ms is not long enough to notice (might be different when playing a virtual instrument).
I think this research is just a useless curiosity (or at most something to slightly improve things like programmatical MIDI players such as Numula). I would expect and feel that in real playing one would not keep a constant 30ms delay and would instead change that continuously based on feeling as I more lengthily articulated in the discussion https://pianoclack.com/forum/d/765-js-bachs-prelude-in-color-with-pianoteq-8-and-leds/28 (which now that I think about it should have been its own discussion and not a hijack of @navindra recording…)