Fix - Allpassphase

The phase transitions most rapidly near 2 kHz, where group delay peaks.

Schroeder’s artificial reverb uses parallel all-pass filters to increase echo density without coloration. allpassphase

Unlike its counterparts, an all-pass filter does not change the volume (amplitude) of any frequency. Instead, it alters the between different frequencies. While it sounds like a transparent "bypass," the way it shifts the "all-pass phase" makes it a cornerstone of modern audio engineering, sound design, and telecommunications. What is All-Pass Phase? The phase transitions most rapidly near 2 kHz,