[LAU] m4a file conversion. Did Apple lock it up ?

[vogel at ct.metrocast.net]

A few days ago my daughter had an organ recital. I should have brought some kind 
of recording device, but when I got there I only had my Iphone. It has a voice
recording app. I think I actually did capture it, but when I migrate the file
to my computer what I get is an m4a file for which I'm not finding
appropriate software. 

I'd like to convert it to a wav file so that I can try to enhance it with audacity.

Conversion software that I tried...failed. 

Anyone know a sure fire way to convert it ?






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