http://askubuntu.com/questions/129996/how-to-set-volume-control-using-a-mouse-shortcut

• 32 bit: main program / gui
• 64 bit: main program / gui

After install by ipkg

# btnx-config

detect nonfunctional button and mapping it! (middle click is BTN_MIDDLE)

then start the daemon

# /etc/init.d/btnx start