Multiband splits an audio signal into separate channels: one for each of up to four frequency bands. It is useful for doing multiband processing using effects plugins that were not designed for multiband processing. For example, you could do multiband compression using two different compressor plugins, one for bass and a different one for treble frequencies. Or you could process a chorus or flanger effect on the midrange frequencies only, leaving the bass and treble clean.
Works well with host app modulation
Keep bass tight and prevent high end from sounding phasey while still having intense stereo widening at mid frequencies
Converts mono to stereo without modifying the tone or sounding like an electronic effect
Spectrum view helps identify the appropriate place to set the cutoff frequencies between bands