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2.5 KiB
2.5 KiB
Yamaha YM2413/OPLL
the YM2413, otherwise known as OPLL, is a cost-reduced FM synthesis sound chip, based on the Yamaha YM3812 (OPL2). thought OPL was downgraded enough? :p
OPLL also spawned a few derivative chips, the best known of these is:
- the famous Konami VRC7. used in the Japan-only video game Lagrange Point, it was another cost reduction on top of the OPLL! this time just 6 channels...
- Yamaha YM2423, same chip as YM2413, just a different patch set
- Yamaha YMF281, ditto
technical specifications
the YM2413 is equipped with the following features:
- 9 channels of 2 operator FM synthesis
- A drum/percussion mode, replacing the last 3 voices with 5 rhythm channels
- 1 user-definable patch (this patch can be changed throughout the course of the song)
- 15 pre-defined patches which can all be used at the same time
- Support for ADSR on both the modulator and the carrier
- Sine and half-sine based FM synthesis
- 9 octave note control
- 4096 different frequencies for channels
- 16 unique volume levels (NOTE: Volume 0 is NOT silent.)
- Modulator and carrier key scaling
- Built-in hardware vibrato support
effects
11xx
: set feedback of channel.12xx
: set operator 1 level.13xx
: set operator 2 level.16xy
: set multiplier of operator.x
is the operator (1 or 2).y
is the multiplier.
18xx
: toggle drums mode.- 0 disables it and 1 enables it.
- only in drums chip.
19xx
: set attack of all operators.1Axx
: set attack of operator 1.1Bxx
: set attack of operator 2.50xy
: set AM of operator.x
is the operator (1-2). a value of 0 means "all operators".y
determines whether AM is on.
51xy
set SL of operator.x
is the operator (1-2). a value of 0 means "all operators".y
is the value.
52xy
set RR of operator.x
is the operator (1-2). a value of 0 means "all operators".y
is the value.
53xy
: set VIB of operator.x
is the operator (1-2). a value of 0 means "all operators".y
determines whether VIB is on.
54xy
set KSL of operator.x
is the operator (1-2). a value of 0 means "all operators".y
is the value.
55xy
set EGT of operator.x
is the operator (1-2). a value of 0 means "all operators".y
determines whether EGT is on.
56xx
: set DR of all operators.57xx
: set DR of operator 1.58xx
: set DR of operator 2.5Bxy
: set KSR of operator.x
is the operator (1-2). a value of 0 means "all operators".y
determines whether KSR is on.