Erik Gulbrandsen shared these words of wisdom:

>> Is there an mp3 codec that I can use with OneNote? Will it record
>> the "follow along" data that one note uses to highlight the
>> various parts of the notes I was taking?
>>
>> I'd like to be able to record lectures while I'm there, then
>> listen to them again later. I'd like to be able to listen to them
>> both in ON and on a portable mp3 player. As far as I can tell,
>> none of the formats that ON is currently recording to is supported
>> by the portable players.
>
> OneNote saves the file as a WMA, and I don't know of an mp3 codec.

That's correct - at least as the *original* format of a recording is
concerned.
But as to my experience it does not matter at all, which format an
*imported* sound-file might have.

> So, if your mp3 player doesn't accept wma, then you are out of luck
> (unless you want to batch convert using the open source program
> audacity).

I do not understand this.
As far as my experiments showed so far, it does not matter which type
of file is used if sound is *imported* into ON later.

Rainald