WordNet sense 1 (a flat plate that controls or directs the flow of fluid or energy):

baffle board

WordNet sense 2 (hinder or prevent (the efforts, plans, or desires) of):

bilk, cross, foil, frustrate, scotch, spoil, thwart

WordNet sense 3 (be a mystery or bewildering to):

amaze, beat, bewilder, dumbfound, flummox, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex

WordNet sense 4 (check the emission of (sound)):

regulate