So with inserts and a delta 1010 you could patch 8 outputs from the mixer to the 8 inputs on the delta, and then output the delta back to the mixer for monitoring, i get that way.

Daisy chain two delta 1010, and one 16 channel mixer for 16 channels in.

Don't most Mackie boards have insets on all channels? On my Yamaha board there are 12 channels, but only 4 inserts.

HP Win 11 12 gig ram, Mac mini Sonoma with 16 gig of ram, BiaB 2025, Realband, Reaper 7, Harrison Mixbus 9 32c , Melodyne 5 editor, Presonus Audiobox 1818VSL, Presonus control app.