DX7 Librarian is a Macintosh program for managing voice data for DX7 synthesizer.
Any voice parameter can be changed on Editor window having direct connection with DX7 over MIDI.
If your Macintosh have a connection with the Internet, you can access to "DX7 Librarian Official Database".
Double clicking on a file in Database window, you can get the voice file on your Mac! The total number of registered voices is 14566 as of today