Allen&Heath GL4 USER GUIDE 1 - Manual (Page 6)

A LLEN & H EATH L TD
GL4 M ULTI -F UNCTION L IVE C ONSOLE
I SSUE : 1 M UTE G ROUP S YSTEM - U SER M ANUAL P AGE : 37
U SING MIDI
N OTE :
If the GL4 Mute System is Disabled, the GL4s MIDI capability is also disabled.
M UTES
Pressing a channel Mute will transmit a MIDI Note On message on the current channel.
Similarly, if the GL4 receives a MIDI Note On message, the appropriate channel mute will
be turned On & Off.
See the MIDI Implementation section for the Mute to MIDI Note translation chart.
M UTE G ROUPS
Pressing a Mute Group switch will transmit a MIDI Program Change message on the
current MIDI channel. This can be used, for example, to change the patch no. of an effects
device connected via MIDI. Also, if the GL4 receives valid MIDI Program Change messages
Mute Groups can be activated & de-activated.
See the MIDI Implementation section for Mute Group to Program Change translation
chart
L INKING 2 GL4 S USING MIDI
You can link the Mute Group Systems of 2 GL4 consoles using MIDI. To do this simply
select one the GL4s to be a MIDI Slave by pressing DOWN it’s MIDI Slave switch. Then
connect the MIDI OUT of the master GL4 to the MIDI IN of the slave GL4. The Control
section of the Slave GL4 is now disabled, it’s Control LEDs, however, will follow the status
of the Master GL4s control section.
Both GL4s must be on the same MIDI channel.