I thought I'd write a little tutorial of how I convert my .aa - audiobooks and hope it will be helpful.
I would have been pretty happy with the format but the MP3- player I had back then only accepted mp3s. The problem was that I wanted one particular audiobook and I only found it on Audible. So I had to find a way if I wanted to listen to it on the player. Another reason is: I want to keep my books even after I cancel my account.
I installed an older version of audible-manager which would allow me to convert the books with dbpoweramp Music Converter. you can get it here:
I got dbpoweramp
and installed that too together with whichever codecs I liked/ needed
For decoding .aa I needed DirectShow Decoder - got that one here:
Now I had to configure DirectShow Decoder (theres a help-file for that in Start - Programs - dbpoweramp - help - codecs) but in short: i selected Start >> Run (for Vista: Windows Key + R), type: "%appdata%\dbpoweramp" and opened the directshow textfile and added there ".aa" so the converter would recognise the files.
From there on I just had to rightclick the files to convert them. There was never the need to register the program because it works with the free version well.
In my humble opinion this is still the fastest and least complicated way to convert audio files.
Other useful tools I tried (because I like my audiobooks in 2 files- 4 files tops I often have to merge them):
Its portable and need not to be installed. I don't know why but it doesn't work for all mp3s.
then I use this:
Shuangs Audio Joiner
for adjusting the sound volume of mp3's I got this:
After I bought my ipod I used this for a long while to create m4b's
mp3 to ipod converter