mc²56 - Central User Button, System Settings Page Functions

This function maps a central user button to a system option so that they can be changed 'on the fly'.

Most of the options come from the System Settings display, and include:

• Display Central Metering - to turn the Central Metering on/off.
• Peakhold Reset - to clear the peak hold indicator on the channel meters.
• PFL Clear, PFL follows Access, etc.

Other functions (that are not from the System Settings display) are:

• Snap Filter – mimic the Global Snapshot ISO buttons.
• LINK, Lock and Bank Layer Mode: Main Bay – mimic the front panel buttons of the same name.
• I/O DSP on Strip – changes the INPUT MIXER mode from SOURCE to INMIX.