SEGA SATURN DEVELOPER'S MANUAL

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FM (Frequency Modulation)

FM is famous for YAMAHA's DX7, but the basic waveform is not limited to a sine wave in this system's FM. Any waveform data in AIFF format can be used for both carrier and modulator. The combination algorithm can be configured freely. It is also possible to change the modulation depth depending on the velocity. The biggest problem with FM is that it uses one slot for each carrier and modulator, which reduces the number of simultaneous sounds. However, if you have one basic waveform (sine wave etc.) as waveform data, you can create various timbres by FM modulation, so it is very useful when you do not want to increase timbre bank data due to restrictions such as RAM It seems.

  Caution  The sound memory is 1024KByte on the target board, but 512KByte on the actual device.
.  The part from which sequence data, DSP program, work RAM, etc. are subtracted is the sound.
 will be assigned to  color. Even if you drop the sampling rate,
  It is practically impossible to put dozens of types of PCM waveforms on the memory at the same time.
 There is .

■ MIDI commands that can be used

Among the events included in the standard MIDI file, the events to be converted by the converter (started from the sound simulator) are as follows. These will be converted without any degradation unless PitchBend is specified to be saved in the preferences.

Note on / off

Note Off is replaced by GateTime.

Poly-Key Pressure

Control Change

(Note that Bank select must exist at the beginning of each track.)

Program Change

Must be present at the beginning of each track.

Channel Pressure Pitch Wheel Change

Supports both 7-bit and 14-bit expressions.

Meta Event

Supports only tempo.

System Message

Excusive, Start, Stop, Song Position are not supported.

If the following conditions are not met, the converter issues an error message and stops the conversion process.

System message is not included in the standard MIDI file. System Message means Excusive, Start, Stop, Song Position Pointer, Song Select, etc.
The number of events included in the standard MIDI file before conversion should be 6143 events or less per track. However, after conversion, Note Off is absorbed by GateTime, so the number of events is much smaller. Similarly, make MetaEvent 256 or less. In addition, the length of one MetaEvent should not exceed 127 bytes.
Be sure to convert Standard MIDI files to Type # 1.
Only one
loop start command (control change No. 31) can exist on each track.
Be sure to set Bank Change and Program Change at the beginning of each track (this does not apply to empty tracks). Note that VOICE numbers and BANK numbers that do not exist cannot be specified using Program Change or Bank Select.

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Note on / off	Note Off is replaced by GateTime.
Poly-Key Pressure
Control Change	(Note that Bank select must exist at the beginning of each track.)
Program Change	Must be present at the beginning of each track.
Channel Pressure Pitch Wheel Change	Supports both 7-bit and 14-bit expressions.
Meta Event	Supports only tempo.
System Message	Excusive, Start, Stop, Song Position are not supported.