Front Panel; Side Panel - Universal Audio Apollo Twin X Hardware Manual

(k) MONO
Sums the left and right signals of the stereo monitor mix into a monophonic signal.
MONO applies to the monitor outputs only. It does not apply to the headphone outputs.
(l) MUTE
Mutes the monitor outputs. When MUTE is active, the MONITOR Selected Indicator (8)
is always lit RED (including when in Preamp mode). When MUTE is active in Monitor
mode, the Volume Level Indicators (2) are also RED.
Note: MUTE does not apply to the headphone outputs. Headphone outputs cannot
be muted.

Front Panel

Refer to the illustration below for numbered control descriptions in this section.
14
(14) Hi-Z Instrument Input
Connect any guitar, bass, or other high impedance instrument here. This jack
automatically overrides the channel 1 mic and line inputs.
Levels for the Hi-Z input are set using the same method as the mic and line inputs.
Note: This jack accepts a ¼" mono TS (tip-sleeve) plug only.
(15) Headphone Output
Connect ¼" stereo headphones here. Volume is controlled with the Level knob (1) when
HEADPHONE (10) is selected with the MONITOR button (11).

Side Panel

Kensington Security Slot (not shown)
The anti-theft security slot on the side panel connects to any standard Kensington lock.
Apollo Twin X Hardware Manual
Front panel elements
27
15
Controls & Connectors