This is an informative post to assist anyone who gets stutter on audio playback. In my case it was streaming from my NAS. All I had to do was add the following to my advancedsettings.xml - Please read the XBMC wiki regarding memory usage...
<network>
<cachemembuffersize>5242880</cachemembuffersize>
</network>
Of course there is all the start and end bits in the file.
Kind regards
Aubrey Kloppers
Cape Town
South Africa