pub const NOTE_LINE_EDGE: f64 = 1.5;Expand description
The low-pass of the note line, as a multiple of the note’s pitch.
A fit after a strike of STRIKE_RISE that is no drop is fitted
again on a line that keeps the band below this edge. That needs the
edge under 200 Hz, the top of the band, so the note sits under 133 Hz.
Below 66 Hz the second and third harmonics of a note lie inside the
band. At -5 to -14 dB they swing the line by more than the note’s
pitch: a real sweep into C1 fitted a residual of 2.5. At 1.5 times the
note the second harmonic falls 10 dB more. A fall that starts higher
then stays the strongest component on its way down. At 1.2 a generated
sweep into C1 with strong overtones read tau 24 % long, and one struck
again inside its note read none. At 3 both read none. Without a
strike, the note line smooths the swing where a retriggered tone
restarts its phase into a fall. Three generated retriggers that rose
0.6 to 1.6 dB read one.