About the MIDI controller:
It’ll actually be 12-14 separate MIDI controllers for 12-14 people. Each one is just one slide potentiometer. Each one has its own channel. This will then be played through a synchronous web platform.
Here is a quick mockup: https://firstname.lastname@example.org/sketches/d3Dxs-qC
The idea is to have 12-14 people controlling different slides from different physical spaces but same digital space.
About variable clock: