Operation Manual

THE MUTE SYSTEM

Each GL4000 input channel, group, aux send and main output (L,R,M) is provided with

a mute switch. This turns the audio signal on or off.

The GL4000 provides a 'soft' mute system controlled by a built-in microprocessor which

gives far greater control and versatility than the conventional systems found in other

consoles. A ramped FET audio element on each channel provides silent muting under

control of the microprocessor. The red LED in the mute switch always indicates the

status of the channel (illuminated = muted, off = not muted). A green SAFE/PREVIEW

LED under each mute switch indicates which channels have been made 'safe', or which

channels are selected within a group or patch.

OPERATIONAL FEATURES

MANUAL MUTING - Press a mute switch to turn a channel on or off. The

switch cap illuminates if the channel is muted. You can also turn off (clear)

or turn on (set) all the console mutes with a single key press..

8 MUTE GROUPS - Combine selected mutes under control of a master

pushbutton. Includes a preview function to check group settings before

selection. Individual channels can be made 'safe' so that they are not

affected by the groups. If not used the group section can be disabled to

prevent accidental operation.

128 MUTE PATCHES - Store and recall the console mute settings in

numbered patches. Includes 3 digit display, preview function, channel

'safes', and disable.

MIDI INTERFACE - In, out and through sockets to interface with external

sequencers, effects and control devices. Includes MIDI dump to archive

and recall console settings.

QUICKSOLO - Check the contribution of individual signals within the

main mix 'in place' by pressing the associated mute switches. Includes a

separate 'safe' facility so that selected channels are not muted when solo

is activated. A two key 'press and hold' prevents accidental operation. The

last solo setting can be recalled for instant comparison with the mix.

QuickSolo can be disabled if required.

POWER UP AND POWER DOWN

The mute settings are remembered when power is removed

from the console. A power down circuit detects falling

voltage and writes the settings to non-volatile memory. On

power up these settings are restored. The mute group,

patch, channel safes, and mode settings are held in similar

memory.