So I am going to go with an FM3 in the loop of an FM9

Newbie here….can I not run a fast link cable between the FM9 and The FM3?
Faslink connects FC controllers to the FM3, FM9, and AX3, it doesn't carry audio. SPDIF would be a good choice for connecting two units in series as it's digital and carries two channels of audio i.e. stereo.
 
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