AFAIK this isn't documented on any other keyboard forum. And if it is it is in Engrish.
Actually it's easier to show than explain in that touchy feely way lot's of oldtimer Geekhackers prefer.
Show Image
(http://geekhack.org/attachment.php?attachmentid=15850&stc=1&d=1299441360)
Much easier than my other ALPS TIL post to understand (http://geekhack.org/showthread.php?&do=comments&p=300980#post300980).
Show Image
(http://farm6.static.flickr.com/5058/5491908893_a9d9bb5975_z.jpg)
Update your 404'd image please.