Looking at the preferences dialog for external controller, it appears that only one device is supported. There is no obvious way to configure a second controller like the extender or the C4, and neither of those are in the rather short list of controller options.
Zemlin thx for the feedback. Like most posts I have read here and elsewhere, It seems that AA2.0 only supports 8 track external controllers. That is rather disappointing, considering how powerful this software is especially with unlimited tracks. Hopefully an update is underway to address this as well as other issues: vsti and improved midi support.
I decided to contact Mackie about this situation. This is the responce:
Hey Raul,
Thanks for writing! The MCU and XT are compatible with
Audition, the C4 however is not. Hope this helps, thanks!
All the best,
Evan Middlesworth
Tech Support
Mackie/Crate/Ampeg/Tapco/EAW
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So 2 out of 3 is not too bad. I kinda figured the C4 would encounter problems but its good to know for certain that the MCU and XT extenders work with AA2.0!