PROBLEM TO BE SOLVED: To provide a game use sound program development support device and a sound program developing method which enable even a person having no programming ability to easily create or develop a sound program for game, and efficiently develop a sound program. SOLUTION: By using registered waveform data and music data (MIDI data) registered by performing an electronic musical instrument, a game music is generated in real time in the same environment as a use environment of a game machine. Then, the registered waveform data and the MIDI data are accumulatively stored in a temporary storage part, and after the game music has been composed, both data are transformed in format and are coupled with a program (driver fundamental program) or a necessary control and stored in a sound program storage part, and read out as a sound program file.
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