1 - With PTP, create an iBook widget tour with a mp3 file. 2 - Then get into the widget (the widget is just a directory, so you can step into it using your Finder), 3 - Go into the "mytourdata/sounds" subdirectory 4 - Replace the "soundx.mp3" files by your m4a files 5 - Go up in the main iBook widget directory 6 - open the panorama XML files. 7 - Find the references to your mp3 file. 8 - Change them by references to your m4a files 9 - Import your widget in your iBook
It will work because the soundinterface.js krpano plugin, is able to play m4a files .
In PTP, our problem to solve this issue is that the flash version of this plugin is not able to play them, so we have manage sound files according to the kind of tour which is built.
Thank you very much, I was already tempted to do this. Will try now. Btw. in order to know who, where and how often your ibooks are read, you can put your web counter code into the index.html file inside the widget.
A bit frustrated: followed your directions exactly. Converted my mp3 to an m4a using iTunes. Tried High Quality m4a first (128kbps) and when that didn't work tried iTunes plus (256kbps). Edited the xml name for the .mp3 extension in all 4 pano xml files. Done it 3 times now. Still get this error: ERROR: sound interface - loading of index data/sounds/sound0.ma4 failed! It's the exact file location. The m4a file plays on the desktop. Any ideas??