Quote:

In the audio drivers section, how do the two cards look? Does RB just list in and outs 1-16?



Yes and no. It shows all 16, but not one thru 16. Unit 1 1-2, 3-4, 5-6, 7-8 and Unit 2 1-2, 3-4, 5-6, 7-8.

Quote:

Have you tried playing a song with both units connected for playback, but using a selecting a different audio input device? If it happens right away (like you say), maybe something is coming back in that causes it, and you could see by this test if it is the input side or the output side of the MOTU.



Tried it with the computer's internal sound card as the input device selected.

Quote:

Maybe even try setting RB to use a discrete thread in the options area. This has solved some weird problems before.



I tried that early on in the process.

Quote:

I assume you've tried each unit separately to make sure one of them isn't causing something in RB to go kerplunk .. I know they work in Sonar, so not likely, but we're just looking for clue.



Yep. Unit 1 plugged into the PCI card output 1, 2, 3, then 4, the Unit 2 plugged into 1, 2, 3, then 4. It works fine in any output with both units when only one is connected.

ONLY when both are connected do I get an error as soon as I push play. Sample rates are correct, everything. If I had a place to post a large video file I would post a chronicle of this showing the connections, how it runs with only one connected, etc.....

30 years of computers and I have never seen anything this strange.