Casio LK-270 - Manual (Page 20)

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Receive
Once this message is received, the Active Sensing mode is entered. If no MIDI message is received for a specified amount
of time, voices being sounded by the Instrument's sound source are released, the controller is reset, and the Active Sensing
mode is exited.
18 System Exclusive Message
Format
The Instrument sends and receives standard universal system exclusive messages, and system exclusive messages that have
Instrument-specific formats.
18.1 Universal Realtime System Exclusive Message
Format
18.1.1 Master Volume
Format
Send
This message is never sent.
Receive
Receipt changes the Master Volume parameter. Note that the Master Volume parameter cannot be changed with an Instrument
operation.
18.1.2 Master Fine Tuning
Format
Note 1:
For information about the relationship between setting values and send/receive values, see "33.4 -100 - 0 - +99 Setting
Value Table" in "Part VII Setting Values and Send/Receive Values" of this document.
Send
This message is sent when the tuning setting is changed.
Receive
Receipt changes the tuning setting.
Message Format: F0H....F7H
Message Format: F0H 7FH....F7H
Message Format: F0H 7FH 7FH 04H 01H llH mmH F7H
ll: LSB Value
mm: MSB Value
Message Format: F0H 7FH 7FH 04H 03H llH mmH F7H
mm: MSB Value(Note1)