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Yamaha Ym2413The YM2413, also called OPLL, is a very low budget sound chip manufactured by Yamaha Corporation and based on their YM3812 (OPL2). To make the chip cheaper to make, many of the internal registers were removed. The result of this is that the YM2413 can only play one user defined instrument at same the time. The other channels have to play one of the 15 built-in instruments. There were other cost cutting modifications such as having only 2 waveforms, and not having the channels added together - instead, the chip's DAC plays each channel one after the other, and the output of this is usually passed through an (analog) filter. The YM2413 was used as a sound expansion on the following platforms: the MSX, the Master System, and a Japanese NES game called Lagrange Point. //The above fact about the Famicom game Langrange Point is not correct. That game uses a chip known as the VRC7, which (I believe) was developed by Konami in-house and used in other Famicom games, such as Castlevania III (Japanese Famicom version only). It is NOT the YM2413. The VRC7 and the YM2413 both use FM synthesis, and both sound very similar, however, that's where the similarities end. If someone wants to edit the page, and make the correction I've mentioned, it would be appreciated. Otherwise leave this message here. (VRC7 needs it's own page by the way, as it has a cult following.)\\ - EchoMorphsapient
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