It is almost year since this post.
Just wanted to tell you that I tested the Jmatch_Sort on Moodle 2.8 on my home server that I set for testing; the exercise that I reproduced (thanks a million to Glenys Hanson for her ideas!) work perfectly fine, with embedded sound players.
Here is a screenshot for how it looks like in Moodle 2.85.
Regards,
Christophe Lapp
P.S. herewith the debug info on an attempt to import a Jmatch_sort exercise into the question bank of moodle 2.85