Will remove center-panned content in stereo tracks by inverting and making mono. Can be used to mitigate vocals in music tracks if the vocals are panned to centre. Optionally you can choose a band of frequencies to invert, rather than the whole channel. This may be less destructive of the content panned away from centre. The resulting audio retains two channels, but sounds mono because both channels are panned to centre.
Invert band or channel: [0="band", 1="channel", default = channel]
Remove frequencies above...: [20 - 20000 Hz, default 500]
Remove frequencies below...: [20 - 20000 Hz, default 2000]