Another approach that I use (also requires an audio interface)...You'll need that interface to have 1 (or 2 if passing stereo material) inputs, and 2 outputs available to connect the Axe
* NOTE: cable as suggested above
You can insert an external effect (the Axe in this case for you; I use a Lexicon PCM-90 reverb) either in a TRACK as an INSERT, or on a BUS as an AUX SEND.
A similar approach could be used in any DAW that supports external hardware (or you could get creative with the DAW's I/O yourself)
IN LOGIC
- Go to the Channel/Bus you want to use (or create one)
- Go to that channel's AUDIO FX box and LEFT CLICK on the right hand side of the box and select UTILITY then IO then STEREO
- Setup the box that pops up with the inputs and outputs you want (that are connected to the Axe-FX)
- Voila - you now have a channel insert OR a buss send with the Axe-FX strapped across it
- PERFORMANCE TIP: If you just want to use the Axe-FX for its F/X (no amps/cabs), you probably want to set it up as an AUX SEND
Added bonus: No AGGREGATE device is required!
Sidenote: I use aggregate devices all the time. As long as you're strapping quality devices together (I use 2 x RME Fireface 800's and the Axe-FX as my aggregate device), it should work fine. Just make sure that you select the highest quality device as your CLOCK SOURCE when building the aggregate device. It's a big plus if they are all running at the same clock rate, but you can also tell the aggregate device to resample on the fly for devices that can't use the project's sample rate. Works amazingly well!