I didn't find this anywhere on the web so I thought I would leave this for anyone to find.
If you don't configure Reaper with ASIO drivers, you won't get four inputs or outputs, only two. This is how you get the others.
After installing the current driver from Behringer, open Reaper.
Refer to the linked image
1. Go to Preferences/Audio/Device and select ASIO as the Audio System type.
2. Under ASIO driver select UMC ASIO driver
3. With Enable Inputs checked, select First as 1:In 1 and Last as 4:In 4
4. Do the same for Output Range
Click apply, then OK and closse the preferences window.
Hope this helps someone in the future.
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