m4a to caf conversion is used when users need to create audio files in Apple Core Audio format (.caf) from a MPEG-4 audio source (.m4a) then you can do that directly in iTunes. Some audio converters and audio editing tools can also be of use here. Generally speaking, it should be no problem to convert m4a to caf audio.
Open M4A file Open CAF fileAudio converter for Windows and Mac