Initialize a multislider with a sine function

Question: How does one fill a multislider of 512 sliders (range -1. to 1.) with a sine wave?

Answer: The 512 numbers produced by uzi go from 0 to 511 (0 to almost 512). Inside the expr object those numbers are multiplied by 6.283185 which is pi times 2, then divided by 512. The result is to give a series of 512 numbers that go from 0 to (almost) 2π. Imagine those numbers as the changing angle in radians as a point travels around the circumference of a unit circle. Take the sine of those numbers and you get one cycle of a sine wave of amplitude 1.