OK, I just tried everything I can think of with my HVR-Z1U.........
I switched from DV to HDV 1080I and recorded a short piece with the shotgun mic and wireless
I then recorded a piece with JUST the wireless
I then recorded a piece with JUST the shotgun
The audio worked fine in each case.
I am sure you know this, but...........if you have the earphones plugged into the jack below the LANC port, the only audio you get in playback mode is through the headset. If you want to hear anything through the cameras onboard speaker, you must unplug the headset.
Please let me know what you find out, just in case this ever affects my cameras.
Thank`s