Alex, please bear in mind that not everyone is a native English speaker. Perhaps I am unable to grasp the nuances of english so that what I wrote sounded condescending to you?
I just tried to answer as comprehensively as I could. Perhaps I should also have supplied links to these discussions on another forums as well as that Roger Linn interview which gets posted into most of the threads discussing the subject?
You need to not get automatically offended by random posts on the internet. There was nothing personal in my reply. Yor thread title implied that the subject was the rytm instead of “why vintage drumcomputer have more groove to my ears than the rytm?” for example.
Lastly, if you read my posts on this board, you might notice that I generally try to be helpful to people instead of looking down on them. Ok, I admit, Now I was being a bit cheeky 
Now then, if we want to more “scientific” on the subject, in the case of the TR-909, I suspect that the discreet electronics contribute to the groove. In the case of the MPC3000, which is 100% digital AFAIK, there are no analog VCAs that might build up charge, and I am suspecting that repeated sample hits also play back identically, so the CPU scheduling is my biggest bet on the timing differences.
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