audio looks good, id probably setup the looper on the sub bus,
though, if you’re happy with mono, then you could aux send.

midi, the mixers usb is for audio only (mixer acts as a audio interface) it does not handle midi.

so you need a usb - midi din converter.
you can get a cheap single din one, then go
laptop -> usb/midi din -> looper -> (thru) volca

or get a usb midi hub, that has multiple outputs so it can go directly to both looper and volca
(id probably do this esp. as your synth might also want clock for things like sync’d lfos, or get midi sequencing data from your computer )

who is master? usually the computer/daw is master, then set everything else to slave.

standalone… will require just then a couple of minor changes
set the looper to be midi clock master (as you computer is no longer there)
then take midi out (rather than thru) of looper into volca

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