User`s manual
AEQ FORUM 
Digital audio mixer for broadcast applications 
83
• “Ring”: allows you to select the GPI where the incoming call signal provided by the 
codec is wired. The key starts to blink when there is an incoming call. This function can 
be combined in the same key with any of the following four functions. 
• “Call GPO”: selects and configures the physical GPO output associated to “CALL” 
function. The key turns on when activated and makes the call from the corresponding 
channel. 
• “On Air GPO”: selects and configures the physical GPO output associated to “ON AIR” 
function. The key turns on when activated and puts the call on the air (ON AIR mode). 
• “Line”: for dual line codecs such as Eagle and Phoenix Studio, this identifies the 
integrated line 1 and line 2, to assign the different GPIs and GPOs for remote control. 
• “OK”: allows you to accept the created or edited configuration. 
• “Cancel”: allows you to reject the created or edited configuration. No change you may 
have made is saved. 
IMPORTANT NOTE: The functions “Call GPO” and “On Air GPO” are exclusive between them 
(a programmable key can have only one of the two functions associated). 
4.3.2.5. Configuration of “Multiplex“ programmable keys. 
Programmable keys that are set to “Multiplex” enables you to make a quick management of 
signal routing toward a “MPX” type internal summing bus (these buses are typically used for 
sending to codecs, hybrids or other auxiliary destinations). A key set to this function is assigned 
with a dedicated icon. 
The lower part of the “Programmable Keys” submenu will show the associated options for 
“Multiplex” type keys, when this configuration mode is selected. In order to be able to configure 
the programmable key (or edit a previously created configuration), you have to press the “Edit 
Configuration” button, to active and allows you to assign to that key one of the 8 available 
“MPX” buses: 
These keys works as follows: when you press and keep pressed the key you can activate the 
routing toward the associated “MPX” bus of any audio input channel assigned to a fader at that 
moment. To activate that routing, you just have to press the “SELECT” key of the desired 
channel/s (the associated LED turns on) while programmable key is pressed; by pressing again 
the “SELECT” key that routing is deactivated (the associated LED turns off). When you stop 
pressing the programmable key, the activated “SELECT” keys turns off and they recover its 
original function. 










