Revert "[1/3] Effects: Add a stereo widening effect"

This reverts commit 4f303bef24152b9421f80ac97e0ebc86a151d124.
Revert "[2/3] Effects: Add center frequency param to bassboost"

This reverts commit a7a082b46b1c2e6526f4f5706505e6547afd268a.