I made everything you suggest Keith but I slowly think something doesn’t work well, especially with the I/O patch…
I explain : if I send in the I/O USB patch the mic source (the mic is plugged in the input 1), to the channel 2 or 3 (even simultaneously, it’s possible), then the mic always appears on channel 1 !!! Due to the routing, it should then appear on channel 2, 3, (…) of my multitrack recording. It’s very strange.
Nothing has an effect on the routing of the tracks in the multitrack recording pannel.
Track 1 is routed to channel 1, 2 on 2, …
It’s like is the I/O usb patch didn’t work.