The Yamaha YRM-502 is a ROM cartridge designed to expand the capabilities of the Yamaha FM Sound Synthesizer unit (SFG-01 or SFG-05). It allows users to alter existing voices and create new ones from scratch using the FM sound generation system. The program supports data display on an MSX computer screen, audio output for checking voice data during editing, and saving created data to cassette tapes, Data Memory Cartridges (UDC-01), or floppy disks.
It is a ROM cartridge used with the Yamaha FM Sound Synthesizer unit to create and alter voices.
The program allows for the creation of a wide variety of original voices in addition to the 46 voices already contained in the FM Sound Synthesizer unit.
Saving voice data to a floppy disk is only possible when using the SFG-05 or SFK-05 Synthesizer unit.