USB output of AE is only for wireless printing; no audio.
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If the printing is wireless why does it need a USB port?
USB printer plugs into AE's USB port; AE and printer can be located in another room, where you send a print job over the air from your computer. Hence no wires from computer to printer; "wireless printing"
AE outputs audio via its combo minijack both digital & analog, but does not output audio from its USB port.