Cited as a reference
Fun with motorized faders
Why people recommend it
Shows motorised faders moving on a digital mixing desk, linked as an example of commercial fader automation when people ask about self-moving controls.
Watch for: Dated footage; demo only
In their words
On commercial systems, it seems much smoother, see this.
tttapa on electronics.stackexchange.com, Feb 2019. CC BY-SA.