Yep, make an aggregate device of the Scarlett + the Yamaha with ASIO and select the aggregate device in Reaper instead of one or the other. The Yamaha has a USB audio interface built into it and thus you treat it like connecting another audio interface. Aggregate devices are configured with your OS audio control panel (ASIO in Windows or Audio MIDI Setup in OSX).
You also have to make one device sample rate clock master and sync the other to it. I suspect the easiest way to try that would be to make the Yamaha master. You'll have to sync off the USB data connection for the Scarlett... this is the part that might get squirrely. Word clock is the pro stable connection. Sync over a digital audio connection is 2nd choice. Sync over the data connection when the other options don't exist is last choice. Don't do it in front of a live audience.
Which leads to Zeecat's suggestion of just connecting the analog output.
Last edited by serr; 09-03-2019 at 09:56 AM.
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