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Old 07-29-2019, 11:53 AM   #4
serr
Human being with feelings
 
Join Date: Sep 2010
Posts: 8,251
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Go to Reaper Preferences/Audio/Device page. Select either your pci connected interface, your USB connected device, or the USB connected Blackstar. This will let you use the device you selected by itself and doesn't rely on OS audio controls.

If you want to try using multiple devices together, search the forum for "aggregate device" to get started.
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