Menu mode messages will be acted upon only when in menu mode, care should be taken not to send menu messages when in a different mode due to buffer repurposing.
'1' - One
Text for the first (top) line of the display.
'2' - Two
Text for the second line of the display.
'3' - Three
Text for the third line of the display.
'4' - Four
Text for the fourth (bottom) line of the display.
'P' - Position
The textual representation of the currently selected menu option (1-4).
'R' - Revision
The textual representation of the playercode version. This will be fomatted and joined by the frontpanel code version from EEPROM.