Yamaha YMF278B OPL4 FM Operator Type-L
The Yamaha YMF278B, also known as the OPL4 (OPL is an acronym for FM Operator Type-L), is a sound chip that incorporates both sample-based synthesis (often incorrectly called wavetable synthesis) and FM synthesis.
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Please check wiki http://en.wikipedia.org/wiki/Yamaha_YMF278
