Conversely, Legacy mode provides full backward-compatibility with Yamaha's YMF262. The drivers for Windows 9x incorporate their own custom instrument patches which make use of this extended mode. In Native mode, ESFM allows more than six 4-operator FM voices to be mapped, potentially allowing for a significant increase in the complexity of tones generated. These were OP元-compatible but developed in-house, with has 20 voices, 72 operators, and operated in two modes: Native and Legacy. All cards post-ES688 got the very good sounding integrated FM synthesizer circuits called " ESFM". Most AudioDrive chips are Sound Blaster Pro-compatible. Electronic Speech Systems (ESS) started in 1989, and are most famous for their AudioDrive chips, used in many sound cards.
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