How can I use both my Allen & Heath Firewire desk and Prism Titan USB interface in Logic?
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From the Audio MIDI Setup in OS X and macOS, you can set up ‘Aggregate Devices’ and ‘Multi-Output Devices’, which allow multiple connected interfaces to be seen as one unit by you DAW. It does take some initial thought and head scratching, but both are relatively easy to set up. If you’re combining two input interfaces into one Aggregate device, you might need to increase the buffer size in your DAW. You can also set the unit with the tightest internal clock to be the master clock for your whole system. Let’s take a look…
To set up two devices as a single unit, firstly go to the Audio MIDI Setup application (use Spotlight search to find it if it helps). You should see the internal system audio in/out, as well as all connected devices, as above. If you don’t, go to...
To further expand on this, here the Midas desk has been clicked first so that its inputs and outputs appear before the Prism Orpheus in Logic. They are now combined as one and should show up that way in your DAW. Name the new Aggregate Device as you...
Click the + button in the left-hand corner of the connected devices window and click on it to create a new Aggregate Device. Now click on the square checkbox next to the devices you want to combine in the order you want them to appear in your DAW.
Choose which device you want to be your master clock by selecting it from the Clock Source dropdown menu. Now this will become your master clock for the whole system. In your DAW, select the newly created/named Aggregate Device from your audio...