1) ok, understand that. but obviously with a resolution of 200 (-100 to 100), this cannot be controlled accurately via MIDI 0-127 so we lose resolution.
The first 32 MIDI channels can be operated as MIDI Double, which gives you 14 bits, but that's rather down to your controller. The H9 supports MIDI double.
To quote WikiP "This fine adjustment is part of the conventional MIDI controller specification, where any of the first 32 controls can be optionally paired with a control offset 32 higher. This is the rare 14-bit Continuous Controller feature of the MIDI specification"
Toodle pip !