The Yamaha YMF278B, also known as the OPL4 (OPL is an acronym for FM Operator Type-L), is a sound chip that incorporates both FM synthesis and sample-based synthesis (often incorrectly called "wavetable synthesis").
The sample synthesis part is based on pulse-code modulation (PCM). It features:
The PCM synthesizer part accepts:
The FM part is essentially a YMF262 (OPL3) block; thus, it is also backwards-compatible with the YM3526 (OPL) and the YM3812 (OPL2). Like the OPL3, it can operate in one of four ways:
The Yamaha YMF262, also known as the OPL3 (OPL is an acronym for FM Operator Type-L), is an FM synthesis sound chip. It is an improved version of the Yamaha YM3812 (OPL2).
The YMF262 improves upon the feature-set of the YM3812, adding the following features:
YMF262 also removed support for the little-used CSM mode, featured on YM3812 and YM3526.
The YMF262's FM synthesis mode was configurable in different ways.
OPL 281 is an asset of Transnational Corporation of Nigeria (Transcorp) Plc headquartered in Lagos, Nigeria. OPL 281 is one of the most prolific remaining oil and gas exploration assets in the Niger Delta. The substantial reserves form part of Transcorp’s integrated energy strategy, which combines power generation, downstream refining and petrochemicals.
In May 2014, Transcorp signed a Production Sharing Contract (PSC) with the Nigerian National Petroleum Corporation (NNPC) and obtained full regulatory approvals to begin oil and gas prospecting in OPL 281. There was also a partnership agreement entered into with Sacoil Holdings of South Africa. This agreement entered into a cul-de-sac in early April 2015 as Sacoil announced they were pulling out of the partnership as a result of its ongoing portfolio rationalization. The pulling out of the South African Oil Giant did not in any way affect the funding of the oil block. Transcorp hopes that by 2017, OPL 281 will begin oil and gas production and has so far acquired and evaluated some 150 sq km of 3D seismic, with its first well planned for drilling by the end of 2015.
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