asterisk users - Feb 2016 - Ast 13 always uses slin internally?

I've ported an Asterisk 10 installation to Asterisk 13, and I've noticed
that whenever Asterisk plays my audio files it uses the slin format.  I have not
converted ANY of my audio files, which means asterisk must be converting my wav
files to slin on the fly.


Is this the new standard for Asterisk?  Should I convert my audio files to slin
format to reduce CPU load?
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