The only
audio
related things for "pod" I could see are: a guitar effects processor
called
a PODxt (there was a POD historically), an audio I/O device called a
Firepod, and the documentation for the LADSPA Perl module. Perl docs
are the only non-coincidental hits for "LADSPA POD".
Pod devices are used in live sound fairly often, probably much more so
than guitarists would like;)
So theoretically you could find a way to put a .pod on a PODxt.
I was trying to think of a name that encapsulated the concept of
pluggable bits of code and mod was gone. A .pod is entirely relevant and
easily memorable.
If it's really available then stake your claim before anyone else does.