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I need help adding audio to my book. I have recorded myself reading, but when I try to upload it it says:

The audio type is not valid.  Only audio files of type .mp3 are allowed. How do I save my sound correctly and upload it? Im using audacity

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Replies to This Discussion

Hi, Tabitha. In order to export audio as an MP3 file from Audacity, you have to install the LAME MP3 encoder. Explanations in http://audacity.sourceforge.net/help/faq?s=install&item=lame-mp3 .I hope this answers your question.

I used Switch Audio File Converter Software to convert an audio file to MP3. It's really easy. Once you install and start the software, you will find a button to allow you to add audio. Then, click another button (convert or export, you have to check) and choose the MP3 as your audio format to be converted to. 

Download site:


I think Cast Builder has a limit on audio size too. I am looking for an easy way to compress long audio files. Anyone has a tip?

Thanks everyone!! I got it finally, even though it was due friday night

Hi Tabitha -

I'm probably too late here, but if you have trouble installing the Lame encoder (which i did) there is a program called Amadeus Pro that enables you to open files in many audio formats and save to others, including mp3. it costs a little money but it is a great program and very easy to use.... (I think it MIGHT be just Mac so if you are on a PC maybe not helpful!)



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