AirTunes multiple routers TC & APE

When extending TC with APE, so as to use APE for AirTunes only, how is audio sent? From Mac to TC to APE, or is Mac addressing APE directly?
Why:
MBA WLAN-N capable
MPB WLAN-G capable only.
APE simply doesn't work for AirTunes (hopeless range) unless set to 802.11N/5GHzONLY, irrespective of "interference robustness" switch;
That setting is unavailable when configured as extension to TC.
Sure enough, AirTunes hopeless again. I was hoping that TC would rehabilitate my MBP, but that I could set TC/APE communication to N/5GHz only. ****. Vivaldi burping hopelessly in the background... range 48" from Mac... coulda hired an orchestra instead of yet another router...
If I can't pull off the WLAN-N/5 only trick, I'll have to identify & euthanize whatever is troubling the default setting: coexisting Linksys G/N router/network, voip/cordless phones, microwave, neighbors.

I now find that setting APX to 802.11N/A works just as well as N/5/only. Advantage: seems my MBPro, which I thought was G-only, handles "A".
Perhaps only the default setting gives flaky airtunes?

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