Hi
I had this issue and solved it some time ago. Its somewhere on this forum, but I better post the "how to" again.
The point is somehow the RME-Driver does not route inputs directly to JRiver, you need first the input to route to output, then that output configue "Loopback" and the it shows up in "open live". Right offset may be a bit crucial, try and try systematically.
I just hera over opne live now, JRiver MC24.0.72PC and RME UFX, Driver of RME: 1.1.66.0
Here how to:
RME UFX
1) go to HARDWARE PLAYBACK /RME Totalmix FX
Select to which output the signal shall go by clicking on the output.
Example: ADAT15/16
2) go to HARDWARE INPUTS / RME Totalmix FX
Signal on analog input, I have there Vinyl/Turnetable:
Example: Analog3/4
Set Volume Slider to volume you want, example: 0dB
Mute: off (button not blue)
Now the signal of Analog3/4 goes to output ADAT15/16
3) go to HARDWARE PLAYBACK /RME Totalmix FX
Click on an output
Example: ADAT15/16
Volume Slider: can be anything
Mute: off or on does not play a role
Loopback: ON, this is they key!!! turn Looback ON
Now the Signal on inputs 3/4 is routed back to to inputs ADAT15/16. You dont see it in the meters!
Now: JRiver, "OPEN Live ASIO", Offset x
In the example. ADAT15/16 are channel 29 and 30. Therefore offset=28 results in 29>1, 30>2 mapping.
An you got your turntable signal, Analog3/4 into JRiver.
Peter