If you've never used a MIDI device with Reaper, your USB MIDI device will show up under the list of MIDI devices in Reaper's preferences menu/dialog. Check the user guide for details bout the different options available for it.
If you have used a MIDI device with Reaper, ditto what mschnell said above.
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Best Regards, Ernie "lunker" Lundqvist
BDSM (Bad Dog Studio Musicians)
Windows 10 running on Z390 + i7-8700
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