Hi all, I'm trying to get 16 channels of audio into Logic 9.1.3. I have two MOTU 8pre's connected via firewire to my mac. One 8pre is connected to the mac's firewire port, the other is connected to the first 8pre's firewire port. They are both recognized by Logic in Audio preferences as '8pre #1' and '8pre #2'. Yet, the best I can do is get Logic to receive 8 channels from one or the other 8pre. It's not able to receive from both 8pre's simultaneously. I even set up an aggregate device, and still got the same results. I didn't think I'd have to run them in aggregate. I thought that Logic could see all sixteen channels because they were connected via firewire. What am I doing wrong?

Troubleshooting #1: What's selected as the input device in Logic's audio prefs?

Hi Ski, Thanks for the reply. I have tried both 8pre's as input devices. Whichever one I choose gives me the eight channels of input from that selected 8pre and I get no Input from the other.

Hi Adam, When you created an Aggregate device in the Audio MIDI Setup did you give the agg. device a specific name? If you then quit Logic and relaunch it you should find it in the Audio Preferences area where select the device to use with Logic. Hope this helps Rounik

Just as a thought, should I be using the optical I/O instead of firewire to connect the two 8pre's? Is this how I can get 16 channels of audio into Logic?

Hi Adam, This rings a bell... you're right... in fact with 2 8pre's you don't need to create an aggregate device. Make sure to connect them via the optical cable and Logic will see 18 inputs. 16 standard inputs + Mix 1 + Mix 2. That should work :)

Thanks for the help, Rounik and Ski. I should be able to try this out within the next few days, after I get some optical cables. I'll let you know how it goes.

Hey, Rounik and Ski, So, it all seems to be working just about like you said, Rounik. Great! The only oddity is that the two 8pre's combined don't give me an option for channels 9 and 10. I have to skip those two channels when setting up the channels in the Arrange page, and use 11 and 12 for the first two inputs of the second 8pre - strange, right. What I'm actually doing is inputting 8 stereo pairs from my 8 iPads. So, ch. 1-8 accommodate the first four iPads on the eight line-ins of the first 8pre, but ch. 11 - 18 are used for the other four stereo pairs, being input through the eight line-ins of the second 8pre. (The second 8pre is in 'converter' mode, and is connected to the first via one optical cable. The first 8pre is, of course, connected to my Mac via firewire). What is happening with ch. 9-10? I get no signal from those two channels into Logic.

Hi Adam, Glad to hear you're almost there! Have you checked in CueMix - or the software that comes with the Motu 828 to see how that's setting up your inputs... :)