Controller master values

All controllers (MIDI-controllers and also automation controllers) shall have one set of "master values" which allow you to set a gain and a bias. Instead of the actual set value, $\textrm{value} * \textrm{bias} + textrm{bias}$ shall be sent to the MIDI device / the plugin. For controllers like "pan", the unbiased values shall be transformed, that is, a pan of 64, with $\textrm{bias}=2$ and $\textrm{gain}=0.5$, shall be transformed to 66 (because 64 is actually 0, while 0 is actually -64). These values shall be set in the arranger and whereever the actual controller/automation values can be edited.