Revert "Earth worm Jim The Boss passed by , and it wasn't happy"

This reverts commit 34fdc99387a142b6ec3c566bad40764ca5f62039.
Revert "Corrected a wrong boundry check for 'experimental downmixing bypass'"

This reverts commit c76e6f94421fac318c1b2290224f1d46fb403acf.
Revert "Added experimental downmixing bypass (if it's the case [no signals on center,rear left/right] - 5.1 only for now)"

This reverts commit a198ab6a134b44ca948173e914ea69150eda83d5.