I've run right into R09... I needed every bit of gain I had... Mic in - high range - gain at max, and as a result it's a bit hissy. I did it once, and didn't bother to do it again.
I had just "cables"... XLR > 1/8" miniplug. If you had Lo-Hi impedance transformers it would probably work much better, and that will provide you with gain, as strange as that sounds.
Hope that helps.