Allpassphase -

allpassphase, allpass filter, group delay, phase response, Schroeder reverb, minimum phase, linear phase, phase distortion, transient smearing, Hilbert transform.

: Adjust this to control how wide or narrow the surrounding frequency band is affected.

Can someone explain what an allpass filter does/how it works?

Next time you’re struggling with a muddy mix or a hollow low end, stop boosting and cutting. Start rotating.