Hi,
Stereo .sap files were just not tested, so i may have done something wrong there.
I will now try your Testfile, and see what i can do to improve it.
EDIT:
I just fixed Stereo playback of .sap files. So in the newest build it should work.
I tested on m:robe100 and h120 and it seems fast enough. I cant really test the speed because your testfile is a looping file, so it never ends :-)
greets,