Universal Audio Apollo x4 - Top Panel Controls; Level Knob Functionality; Gain & Volume Indicator LEDs

Apollo x4 Hardware Manual Controls & Connectors 22
Top Panel
Refer to the illustration below for numbered control descriptions in this section.
Top panel elements
(1) Level Knob
The Level knob controls multiple functions. The knob’s current function is selected with
the PREAMP (10) and MONITOR (12) buttons.
When in PREAMP Mode, rotate clockwise to increase the amount of preamp gain for
the currently selected input channel (3). When in MONITOR Mode, rotate clockwise to
increase the monitor or headphones volume, depending on the stereo output currently
selected (5) with the MONITOR (12) button.
Unison Integration
The Level knob can also be used to control Unison-enabled UAD preamp,
guitar/bass amp, and pedal plug-in parameters. See the Apollo Software Manual
for complete Unison details.
(2) Preamp Gain & Volume Level Indicator LEDs
The LEDs surrounding the Level knob indicate the relative level of the selected function
(either input channel preamp gain or monitor/headphone volume).
Note: The Volume Level Indicator LEDs are RED when MONITOR (5) is selected
and MUTE (8-l) is enabled.
MONITORPREAMP
MONITORPREAMP
OPTICAL
OUT IN
OFF ON
12VDC
POWER
1
2 R
LINE OUT MONITOR
3
4
LINE OUT
MIC/LINE 4 MIC/LINE 3 MIC/LINE 2 MIC/LINE 1
L
OPTICAL
OUT IN
OFF ON
12VDC
POWER
1
2 R
LINE OUT MONITOR
3
4
LINE OUT
MIC/LINE 4 MIC/LINE 3 MIC/LINE 2 MIC/LINE 1
L
1 2 1 2
a b c d e f
g h i j k l
43
8
7
12
5
6
9 10 11
161718
21
20
19
15
13 14
1 2