I had an exchange with FLDEADHEAD via PM, but guess others may benefit from the info. I run a digimod UA-5 > R-09 and here is how I run it. And yes, I am aware of the extra AD > DA conversion in the chain, but until I get a reliable recorder with a digi input, it is what it is.
I've been running the UA-5 for a couple months. I run the RCA out on the UA-5 to the R-09. As for settings, Input monitor SW ON and the input monitor volume should be all the way to the right. Same for the output master volume. I then adjust the levels using the sensitivity knobs. There is some discussion as to whether the input monitor should be on, but as far as I can tell, this applies to digital outs, not the analog outs being used to go to the R-09. If I don't have the input monitor on and levels all the way up, I get no output to the R-09.