What is the difference between FM and OPL MIDI?

Hello there, I would like to ask your help with this old DOS game 'Amazon – Guardians Of Eden' because I do not understand in the config the MIDI settings.

It says
…(3) ProAudio Spectrum (FM)
(4) ProAudio Spectrum (OPL)…
…(7) Sound Blaster Pro (FM)
(8) Sound Blaster Pro (OPL).
What is the difference between the FM and the OPL within the same sound card?



Source: https://www.reddit.com/r/oldgames/comments/vckwto/what_is_the_difference_between_fm_and_opl_midi/

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