Soft Function Buttons; Mute Functions; Plm Input Mute; Module Input Mute - Lab.gruppen PLM Series Operation Manual

9 FRONT PANEL INTERFACE
9.10 soft-function buttons
Eight silicon rubber buttons are set adjacent to the
display in two groups of four. These buttons are
unlabelled because their functions change according
to the on-screen page currently displayed.
Figure 9.10: Front panel soft function buttons
In METER mode, and with MUTE ENABLE active, the
soft function buttons are used to mute and unmute
the PLM's individual Module inputs and power stage
outputs.
In MENU mode these buttons are used to navigate
the menu structure.
Each button contains a tricolor LED. This
LED conveys fault and warning indication
as well as mute statuses. The LED's
function does not necessarily correspond
to the current soft button function.

9.10.1 Mute functions

The PLM provides mute functions at several different
points in its audio chain. See figure 8.1 (PLM Signal
Flow Diagram) for mute locations and description.
The four available mutes are:
1. PLM Input Mutes
2. Module Input Mutes
3. Module Output Mutes
4. Power Output Mutes
30 PLM Series Operation Manual
Two of these mutes may be controlled from the PLM
front panel by using the MUTE ENABLE button;
these are:
▸ Module Input Mutes
▸
Power Output Mutes
For safety it is not possible to change either
of these mutes without first selecting MUTE
ENABLE.
It is also possible to control these mutes from the
DLC PLM Edition software. Module Output Mutes
can be controlled via the menu system (i.e. in MENU
mode, not METER mode) or the DLC PLM Edition
software.
When MUTE ENABLE is selected, six of the front
panel soft function buttons become the mute
switches for the Module Inputs and PLM Outputs.
See figure 9.6.
Module A
Module B
Figure 9.10.1: Soft function buttons in Mute mode

9.10.1.1 PLM Input Mute

Muting of the PLM's inputs is not available via the
MUTE ENABLE button in METER mode. It can only
be actioned from the DLC PLM Edition software.
PLM Input Mute is within the Dolby Lake processing
system, post input type selection, and pre input
mixing and routing.
Refer to the Dolby Lake Controller User Manual for
details of mute selection via the software.

9.10.1.2 Module Input Mute

The center pair of soft function buttons located on
the left hand of the screen (soft function buttons 2
and 3 - see figure 9.6) control the input mutes. Button
2 toggles the input mute of Module A in the Dolby
Lake processing system, while Button 3 toggles the
input mute of Module B.
Ch1
Ch2
Ch3
Ch4