Hi,
please provide more informations!
e.g. either the full xml code or the a link the example,
and what do you do in your plugin swf?
how do you play the sound?
how do you load the soundinterface plugin?
one more details about sound stopping - when you using the correct soundinterface plugin version and call "stopallsounds(true)" then krpano calls the Flashplayer
SoundMixer.stopAll() function - this should stop all sounds from the same security sandbox - when your plugin or that sound that it plays runs in a different sandbox then krpano is not able to stop it, then you would need to do that by yourself in your plugin,
best regards,
Klaus