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Here is what I did: I put sw085 on the guitar track and sw140 on the string track, and when I change tempo I mute one track
and back to normal the other track.




That is the way to do it. We can't change a RealTrack to another in midstream on the same track. At least, not with this version.

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Another little problem, the max limit of sw140 is tempo 160, and I need to reach 192 ...
Here is what I did: when I import the project, midi and real stuff in the sequencer, I used a desser plugin on the
Freddie Green real tracks to attenuate some noises induced by the out of range tempo.




From that, I take it that you must not be using the new BiaB2010 version. There is a new feature, "halftime and doubletime realtracks" that allows us to use RealTracks that are a lot farther out of their Tempo range without the artifacts now. You used a great workaround to get the job done, though, and I think you should be commended for that. My kinda thinking. "Git-R-Done!"

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As I used 2 different tracks in BIAB and sequencer, I finish by creating different presets in my sequencer for
the desser plugin like Fred060 if generated by sw060 Fred RealTrack, and so on

Does it exist a better or simpler method ?




Any method that gets the job done with good sounding results is the "better" method. You might find things to go a bit simpler with the BB2010 upgrade, though.


--Mac