System Exclusive Messages; System Realtime Messages - Yamaha S70XS Reference Manual

System Messages
System messages are the data related to the overall system of the device.

System Exclusive Messages

The Device number of the synthesizer must match the Device Number of the external MIDI device when
transmitting/receiving bulk data, parameter changes or other system exclusive messages. System
Exclusive messages control various functions of this synthesizer, including master volume and master
tuning, tone generator mode, effect type and various other parameters.
Some System Exclusive messages are called "Universal message" (ex. GM System ON), and do not
require the Device Number.
General MIDI (GM) System On
When "General MIDI system on" is received, the synthesizer will receive the MIDI messages which are
compatible with GM System Level 1, and consequently will not receive Bank Select messages.
When the instrument receives the GM System On, each receive channel of Parts 1 – 16 (in a Multi) will be
assigned to "1 – 16."
F0 7E 7F 09 01 F7 (Hexadecimal)
NOTE
Make sure that the interval between this message and the first note data of the song is at least a quarter
note or greater in length.
MIDI Master Volume
When received, the Volume MSB will be effective for the System Parameter.
* mm (MSB) = appropriate volume value, ll (LSB) = ignored
F0 7F 7F 04 01 ll mm F7 (Hexadecimal)
Mode Change
When received, the mode of the synthesizer will be switched.
* n = Device Number (page 138)
* m = 0 – 6 (0: Voice, 1: Performance, 2 – 3: not used, 4: Master, 5: Multi, 6: Demo)
F0 43 1n 7F 0D 0A 00 01 0m F7 (Hexadecimal)

System Realtime Messages

Active Sensing (FEH)
Once FEH (Active Sensing) has been received, if no MIDI data is subsequently received for longer than an
interval of approximately 300 msec, the S90 XS/S70 XS will perform the same function as when All Sounds
Off, All Notes Off, and Reset All Controllers messages are received, and will then return to a status in which
FEH is not monitored.
Timing Clock (F8H)
This message is transmitted with a fixed interval (24 times per 1/4 note) to synchronize connected MIDI
instruments. You can select whether the sequencer block uses the internal Timing Clock, or external
Timing Clock messages received via MIDI IN by setting the MIDI Sync parameter: [UTILITY]  MIDI 
MIDI Sync.
Reference Manual
Appendix
Basic Structure
Functional Blocks
Tone Generator
A/D Input
Arpeggio
Sequencer
Audio Record/Play
Controller
Effect
Internal Memory
Reference
Voice
Performance
Multi
SEQ Play
Master
Remote
File
Audio Rec/Play
Utility
Appendix
About MIDI
Display Messages
Troubleshooting
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