Enable vu-meter button :
Display or not the icon to access vu meters. 
Vu meters indicate output audio levels of the 4 AirDDO channels and of the 5th channel (input and output).
External remote lock button :
This option allows users to display a button 
in AirDDO to lock or unlock one or several physical mixing boards.
When locking the mixing board, users temporarily prevent any action from being performed via those external devices.
Ingoing GPI lock button :
Display or not the icon to lock/unlock ingoing GPI signals.
Outgoing GPI lock button :
Display or not the icon to lock/unlock outgoing GPI signals.
By checking the "Locked by default" box, the button will be locked every time AirDDO is open.
Display Audio bank :
This option allows you to dispaly or not the icone to access the AirDDO audio bank 
.
Audio bank can store up to 2500 sounds by using 50 tabs of 50 lines each.
