[url=http://www.tcbmi.com/strokeit/forum/read.php?3,2364,2369#msg-2369]This post[/url] gives the commands to use for up/down and mute.
[url=http://www.tcbmi.com/strokeit/forum/read.php?4,4101,4112#msg-4112]This post[/url] shows how to control the volume applet.