what funkybot said !
same for all those other wonderful proprietary Apple, Adobe, Sun, MS etc datamining brainf*rts, Flash, Java, Air, you name it.
stick with basic, open protocols that simply do the job, no "added value" required, and certainly no internet access !
FLAC is a good one for example, glad to see it supported.
this reply is mostly directed at future development, S1 3.21 works fine offline atm (except for a few quirks like access to the Macro toolbar), please keep it that way !
Rhino