Decoder sub module supports Dolby D, Dolby E and AC3 signals. It fits onto Avenue modules that benefit from comprehensive audio handling. In addition to the hardware sub module, a unique software key is provided for activation. Decoding option can be fed from either an AES input or an AES stream disembedded from the main module's incoming SDI signal. The resulting discrete surround signals are then selectable as inputs to the main module's channel mixer and shuffler.