One of the Single Part Plug-in Boards.
The sounds of the DX7 are available on this Plug-in Board. Unlike PCM-based tone generators, this board uses the FM Synthesis system N the same as found on DX-series synthesizers N for versatile and dynamic sound shaping potential. Sounds are compatible with those of the DX7, and the board can even receive DX7 data via MIDI bulk dump.
FM tone generator