Alter Aeon Online Help

Keywords are:  'msp mud sound protocol'

Syntax:
set msp
set msp on
set msp off

Alter Aeon supports MSP (Mud Sound Protocol.)  Normally this is enabled
automatically if your client supports it.  If you want to force MSP
mode or disable it at the server, use the 'set msp' command.

MSP mode can also be manually enabled prior to login by entering
'set msp on' from the main login menu.