Apparatuses for generating negative impedance compensation are provided. In one embodiment, buffer space within each compression path is monitored and the source data stream is directed to a starved compression path. The lightpipe is coated with a thin layer of visible-light transparent material which is doped with organic dye molecules. The recovery credit account includes a credit limit that is lower than the opening balance. The cam profile is shaped to adjust the position of the beam relative to the pedal arm as the pedal arm swings relative to the vehicle.