Solved, sorry : invoking indi_gphoto_ccd is not equivalent to invoking indi_canon_ccd though the latter is a symlink to the former.

So if owning a canon, invoke indi_canon_ccd

Still, it might be worth mentioning in the faq, though I should have tried it.

Thanks again, the sky is clear, roof is opened, I will attempt my first simultaneous acquisitions (wide field on a T80/760D, narrow field on the C14/Atik 4000), target will be m101
Best.
--
fm

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