This short clip from Ableton's Learn Live series covers how to switch Shifter from Internal mode into MIDI mode, where incoming MIDI notes control the pitch or frequency shift instead of the Course and Fine knobs. It also flags an important behavioral detail: Shifter is monophonic and always responds to the last MIDI note received, which shapes how you route and play into it.
The Glide parameter sets the time in milliseconds for notes to slide from one pitch to the next, giving you control over portamento-style transitions. Pitch-bend range can be set anywhere from zero to 24 semitones, defining how much an incoming pitch-bend message affects the shift amount.