) on the reverb tail to cut out the bass and prevent the mix from sounding muddy. A low-pass filter can also tame harsh high-frequency buildup.
Reverb is a dense collection of echoes. Sabine’s equation ( RT_60 = 0.161 \fracVA ) (where (V) is volume and (A) is total absorption) dictates that for maximum reverb, absorption (A) must approach zero. In digital systems, this is trivial to simulate, but psychoacoustically, once echo density exceeds the fusion time (~50–80 ms), the ear stops hearing individual reflections and perceives a "wash."
Setting the reverb tail to 5, 10, or even 20+ seconds, creating a sound that barely fades.