Hello,

For my audio application, I would like to have a scrub wheel which moves 
forwards and backwards on (if need be) a sample-by-sample basis. As user 
interface, something along the lines of the Fl_Roller wheel would be 
ideal. However, unfortunately, what I need is ever so slightly different.

The Fl_Roller wheel works with absolute values, meaning it has a lower 
and an upper boundary. What I'm looking for should act as though it is 
truly rotary- having a callback with negative value when dragged to the 
left, and a callback with positive value when dragged to the right.
When dragged to the right 100 pixels in 3 callbacks, it might 
perform 3 callbacks with values 30,40,30 respectively (depending
on dragging speed).

Does something like this exist? If not, how do I go about modifying the 
existing Fl_Roller wheel?

Best,
Marc

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