Some tests on audio export

[Sherry C]

Hi David,

Thanks for the report. It's very helpful to know that something does indeed work well. Oftentimes when we include a new feature, or fix a bug (we do in-house testing of course), we stop getting any communication about it from users, and so have to conclude from the lack of communications that the thing works. It's much nicer to have direct confirmation

ttfn,
Sherry