Mellite - Tutorial - Part 6: Creating Widget programs

Introduction to the Mellite computer music environment. Part 6: Creating Widget programs. This is based on Mellite v2.25.1. See https://www.sciss.de/mellite/ for details. (apologies for again bad sound quality, aggravated by the laptop fanning running due to the climate crisis). See also part 10 for more examples (OSC) of widget programs. __Erratum:__ 4:13 actually `s.value() = 72` is `update` syntax not `apply`