Yes, I also play with defined tempo. only undefined loop lengths, and overdub very necessary. and always multiples of bars (no odd or weird loop lengths)
I have been trying now, and I can get a flex recording by pressing AB (quick rec mode on). In the record menu I assign rec sources AB and T1 (recording on T1…)
so how do I get the flex machine to start looping after this?
If I press AB or CD nothing really happens, or sometimes the track stops. If I press TRACK+PLAY the flex start playing back, but also keeps on recording…
EDIT: I give up again… I see the flex also guesses the BPM. now I understand what you mean with defined tempo. but playing live, a song can get a bit faster or slower, depending on the vibe. So I think the flex method also won’t work out for me