Radio now aac rather than mp3

[Christopher Woods (CustomMade)]

> Hi
> To get mp3 instead of aac use this:-
> --mode=flashaudio


Please do bear in mind though that (from my own empirical comparisons) it
seems the iPlayer just TRANScodes the original AAC audio to MP3, it's not
encoded fresh from the original source audio. So if you choose the MP3
option, you'll end up with a noticeably lower quality audio file.