Workaround for "aactomp3"

[Chris Marriott]

I've just upgrade GiP from 2.94 to 2.99 because of the metadata feed issue, 
and now I have a slight problem. For downloading radio programs I relied on 
the "aactomp3" option to automatically generate MP3 files, but this has been 
removed from v2.99. ISTR reading on the list a while ago that there was a 
workaround available to get the functionality back. Could anyone remind me 
what it is, please?

Many thanks,

Chris