pub const SETTLE_FRAC: f32 = 0.9;Expand description
Fraction of a step’s total change the response must reach to count as
settled. 0.9 is the textbook rise-time convention, and it is the one the
one-pole arithmetic in ADR-0019 is quoted against: a smoother with time
constant tau reaches it at t = tau * ln(10) = 2.303 * tau.