Reaper can't give you anymore volume that any other DAW. That is gained by the incoming signal, the gain staging thru compression and master limiting.

Arming multiple tracks is simple with RB. Hold Alt, and click on the tracks you want armed to highlight them, and make sure that each is assigned to a separate input, then hit record.


HP Win 11 12 gig ram, Mac mini Sonoma with 16 gig of ram, BiaB/RB 2026, Reaper 7, Harrison Mixbus 11 , Presonus Audiobox USB96