A digital interface apparatus is provided for use in an analog musical instrument
capable of generating an analog audio signal, and is designed for interfacing with
an external digital audio apparatus. In the digital interface apparatus, an input/output
interface converts the analog audio signal generated by the analog musical instrument
into a digital audio signal. The input/output interface has an input terminal and
an output terminal for transmitting the digital audio signal to the external digital
audio apparatus and for receiving a digital audio signal from the external digital
audio apparatus. A digital signal processor processes the digital audio signal
which is either converted from the analog audio signal or received from the input
terminal. A main controller controls operation of the digital signal processor
according to instructions. An operating member is manually operated to provide
the instructions to the main controller.
