1. An audio signal processor to perform an audio processing function upon an input audio signal, comprising: an audio processing device including a digital signal processor to modify an input audio signal in accordance with a signal processing instruction set; and a removable module having a signal processing instruction set, wherein, when the removable module is coupled to the audio processing device, the signal processing instruction set is transferred to and implemented by the digital signal processor of the audio processing device to perform an audio processing function upon the input audio signal.