They also released two wavetable chips, ES689 and ES690F. This same year they announced ES1868, ES968 followed soon after by the ES938 Audio Effects Processor. In 1995, ESS launched the first all-in-one 16-bit audio chipset, ES1688. Lots of games had specific support for ESS sound cards. Many DOS gamers prefer the softer sound of the ESFM over Yamaha's original OP元 output. ESFM's output in this mode is moderately faithful to the YMF262 overall, but some tones are rendered quite differently, resulting in unique distortions in the sound and music of some games. 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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