Description

Video: https://youtu.be/21Ir6xjvsCk

Expander is a mono to stereo widening tool. The signal is delayed and the left channel is polarity inverted. Then it's mixed in parallel with the dry signal creating a sort of comb filter effect that sounds very wide. Precisely tuned all pass filters are added to the delayed signal to "blur" each end of the frequency spectrum. This makes for better width in the extreme low and high end.

Enjoy!