Deadband/Dead Zone on Control

Hi there, sorry if this has been covered elsewhere. I am trying to accomplish the following: Using a Unipolar fader as a bipolar control (in my case for a granular pitch shifter) which should have a dead band in the middle so it is easier to dial in a pitch offset of 0 or in the case of the fader a control value of 0.5. Since the fader does not have a physical detent, I was hoping to be able to do it in the digital domain in the 301. The deadband filter, however, is only useful for filtering rapid changeā€¦ Also I could use a transfer function via sample scanner but was wondering about a more cpu efficient solutionā€¦