Disclosed are a process and apparatus for selective catalytic reduction of NOx. Embodiments of the present invention provide audio message files associated with the activation of a control or provide other device status messaging Audio messages are also provided in file sets that are user selectable to give the user a choice of \u2018themes\u2019. A swap command is adapted to instruct the memory controller to swap the first and second base addresses. Second, the gift giver transfers the gift redeeming information to a gift recipient of choice. The running integral of the counter digital waveform represents a sinusoidal digital waveform output of the NCO. A quantization parameter predictor for deriving the quantization parameter is created using quantization parameters of a left coding unit and a top coding unit of a current coding unit.