I have used in my current setup the XLR outputs of The River and record the River as a stereo with its FX to my Metric Halo LIO-8 interface.
Newbie question:
I want to record a bass and other certain type of sounds as a mono. What is the best way to do that?
If you're using only one voice and don't need FX from The River, the easiest way to record mono is to take that single voice straight out from the individual outs 1-8 and into your interface.
If, however, you're wanting to record in mono using multiple voices, I would sum the stereo output of The River in a mixer first then record that as mono.
Another method would be to pan voices either hard left or hard right on The River. If, for example, I wanted to record a split patch using two different sounds, but also wanted to be able to mix or process them later individually, that's what I would do--pan all the voices for sound 1 hard left, all the voices for sound two hard right--then record each channel separately as a mono track in my DAW.