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Update opl.md 

ditto
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freq-mod 2023-06-14 11:17:42 +02:00 committed by tildearrow
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@ -3,7 +3,7 @@
a series of FM sound chips which were very popular in DOS land. it was so popular that even Yamaha made a logo for it!
essentially a downgraded version of Yamaha's other FM chips, with only 2 operators per channel.
however, it also had a drums mode, and later chips in the series added more waveforms (than just the typical sine) and even a 4-operator mode.
however, it also had a [drums mode](opll.md), and later chips in the series added more waveforms (than just the typical sine) and even a 4-operator mode.
the original OPL (Yamaha YM3526) was present as an expansion for the Commodore 64 and MSX computers (erm, a variant of it). it only had 9 two-operator channels and drums mode.
@ -77,4 +77,4 @@ afterwards everyone moved to Windows and software mixed PCM streaming...
- only in 4-op mode (OPL3).
- `5Bxy`: set KSR of operator.
- `x` is the operator (1-4; last 2 operators only in 4-op mode). a value of 0 means "all operators".
- `y` determines whether KSR is on.
- `y` determines whether KSR is on.