Well, here is my opinion on the a/d in the ua-5, so if that is the goal of this, to utilize just the a/d here goes...
The a/d is just not that good. Some people like it. I personally think it sounds a lot like that of the da-p1's! Maybe the mod's change this, but I have only used one without a pre mod! I would have been just as happy running line-in to an m1 as I was with the adc of the ua-5. I think were the ua-5 shines is that it is easy as all hell to use, provides phantom, and with the right pre mod, sounds decent! And it is cheap! The stock pre in the ua-5 is just awful to my ears if aplying any more than about 12 o'clock worth of gain. YMMV
Daryan
Daryan