Bought one of these and patched it to my main out on interface, then plugged my monitors and headphones into it. Just dial in the volume on the one you want

https://www.monoprice.com/product?p_id=615220


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.