Tracing mouse events

[Rolf G Nielsen]

Does anyone know a utility, that would let me se mouse events in human 
readable form? I recently bought a new mouse, which moused reports as 
having 16 buttons, and xmodmap -pp reports 15 buttons.

As far as I can see, it doesn't have 15 or 16 physical buttons. If I 
count the wheel as two buttons, I get 8 or possibly 10:

left & right (two buttons)
pushing the wheel (one button)
scrolling the wheel (two "buttons")
tilting the wheel left or right (two "buttons", which I guess are 
intended for horizontal scrolling)
and a thumb button (one button)

There are also two buttons, that increase or decrease the resolution of 
the mouse, but I don't think those generate any mouse events.

I'd like to find out which button is which, so I can install an actual 
xmodmap that I'm happy with.

/Rolf Nielsen