An improved digital signal mixing architecture (100) for applications such as digital mixing consoles (76) is provided. The architecture provides a software configurable mixing system that is expanded up to more than 48 channels. The architecture comprises a master DSP (12) device coupled to a plurality of slave DSP devices (10) on a DMA bus (28). The master DSP (12) is interconnected to each of the slave DSPs (10) in a manner that enables the master DSP (12) to command each of the slave DSPs (10) to write the results of its input signal processing to the internal memory of each of the other slave DSPs (10). The master DSP (12) commands the slave DSPs (10) to transmit processed input signals to each other, so that each processed input signal is stored in the memory of each slave DSP (10). Once each slave DSP (10) has the results of every processed input signal, the master DSP (12) commands any combination of the slave DSPs (10) to mix any of the processed input signals to create a mixed signal that is sent to its outputs for conversion to an analog signal (18b). Mixing combinations are controlled by scripts that are interpreted by software. The digital mixing architecture (100) provides a system that is software configurable, so that mixing console is easily reconfigurable and upgradeable.