Best audio format to embed for export to pdf?

Hello, I was wondering what format for audio file would be best to embed for exporting to pdf. I want to embed the audio file in a button, for playback on mouseover in the exported pdf. Previously, when I had CS3, I actually had to convert my mp3s to avi files, as (believe it or not) that turned out to be the only format that would play back properly with a toolbar in the pdf, and only after I changed the media player (from quicktime to flash) for EACH audio file in the pdf. It was a headache trying to embed hundreds of audio files and I'm just wondering if CS5 has improved.

Steve, that's (if I remember right) why I had to convert my mp3s to avi when I used CS3; because when I played them back in the exported pdf there was no controller-- but there was for avi. The problem I then had was with Acrobat/reader, which had quicktime set as the default player, so when I clicked the button to play the audio (avi) file, the pdf froze. This I solved by changing the default player FOR EACH audio file in the document (there were over 400) to adobe flash player; and because the audio was avi, as you say, a nice controller appeared, which disappeared once the audio finished. This was an OK workaround, if it wasn't for the fact that because I was using the flash player, the interactive pdf couldn't be used by mac users-- which many of the ebook's readers are. D'oh! So now I'm thinking to just stick with the mp3 format, now that Indesign can handle mp3s, and as you say, create buttons for stop and playback; this also solves the problem of having to post-export adjust the player settings for each file, which is not very fun, because when you edit the indesign document for future versions, it's kind of an annoyance to import pages to replace pages in the pdf without replacing the audio files. Anyway. Steve thank you for thinking out the finer details of my issue; I appreciate it and will have a go at making buttons, and let you know how that goes for such an interactive pdf. Thanks also Bob for the reply.

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