>> One issue is the placement of the knob
relative to the edges of the screen
>> and what you do when the pointer (ignoring touch) reaches them.
That is why being able to adjust with both horizontal and vertical
movement is a plus. Take a look at zita-mu1 for an example. It is also
important to continue watching the position of the mouse when it leaves
the application window.
--
Len Ovens
www.ovenwerks.net