That is very surprising. I was under the impression that the TZT units would at least have the same capability (if not more) than the older models, especially since the BBWX3 has a audio output (which my installer has already hooked to our head unit). I don't know what to do at this point; literally every other electronics manufacture offers this audio service and has for years. Please tell the powers that be to come up with a software version that will allow the XM audio.