Many thanks Noel (and congratulations for your latest song ;-)

Indeed, it's certainly in the bar setting that I will find the solution. But I've tried as you've explained below, and the result was so strange! It's perhaps because I'm using real track in 4/4.

So I should perhaps also find a way to change not only the rhythmic but also the real track accompaniement for each chorus!?
I'm still trying to find the best solution, and will come back here if I get it.But if you have any idea...

Thanks,
Kind Regards,
Christophe