Changes
/* OPL3 sound chip */
* Another setting pairs 12 of the FM chans into 6 FM 4-op chans
* Both settings can be used at the same time, to obtain 6 FM 4-op chans + 3 FM 2-op chans + 5-chan FM percussion set
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==== Basic Components ====
The most basic elements of an OPL FM synthesiser are:
* envelope generators, which vary volume over time;
* phase generators, which produce a waveform such as a sine wave at a programmatic rate;
* operators, which combine an envelope generator and a phase generator;
* a global low-frequency oscillator which can provide additional vibrato (i.e. back-and-forth modification of frequency) and tremolo (like vibrato, but for volume) to operators;
* channels, which combine operators to produce a single tone output;
* a distinct rhythm section, which incorporates a noise generator with some of the parts above to provide a few fixed percussion noises.
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==== FM Percussion Set ====
