Revert "Revert "[3/3] AudioFX: Add center frequency param to bassboost""

This reverts commit 4d01e8e88e68436349f8a439bc6fa988c327a682.
Revert "Revert "[3/3] AudioEffect: Add a stereo widener effect""

This reverts commit d02dbf245113bb95271c74824592995e2ab4320d.