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4 anni fa2.6K views



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This is a demo of my circuit that uses a PIC microcontroller and an old ISA bus soundcard to create a small midi expander. Sounds are generated manipulating the OPL-3 chips registers, so all timbers are generated with FM. Don't ask for PCM, is impossible with such circuit. The Casio keyboard is used to send note events and program change events. The expander actually knows just such events, but full C sources are available, so everyone can implement the program.

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