[HELP] Audio Message about "Ignore" when I have "Custom" selected

[Hushpower]

I'm trying to apply QTGMC to an MPEG 2 file and then export to UT AVI with PCM audio. For the audio, a have chosen Custom from the droplist. I've then set up the audio tab for PCM export OK, I think.

When I add to the job queue, I get the attached message, which doesn't make sense to me because I have set Custom, and not Ignore.

Thanks for any pointers.