User Manual
Apollo Twin MkII Hardware Manual Controls & Connectors 19
MONITOR Mode
When Apollo Twin MkII is in Monitor mode, all top panel controls are related 
to output functions only. To adjust any output function, press the MONITOR 
button to enter Monitor mode and activate the monitor controls.
Note: Input functions cannot be performed in Monitor mode.
Important: Apollo Twin MkII must be in Monitor mode to change the volume of the 
monitor and headphone outputs.
Stereo Outputs
Apollo Twin MkII has two stereo outputs that can be controlled with the top panel 
hardware: Monitor and Headphone. The stereo outputs are independently controlled.
Note: Line outputs 3 and 4 are controlled with software only.
Output Controls 
The Level knob is used to set the volume level for each stereo output independently. The 
Level knob adjusts the volume for the currently selected stereo output. After switching 
the selected output with the MONITOR button, the other output volume can be adjusted.
Output Selection
The currently selected stereo output is shown by the MONITOR and 
HEADPHONE indicators at the right of the main display, above and below 
the output meters. 
When in Monitor mode, press the MONITOR button to change the selected 
output. Press again to switch to the other output. The Level knob adjusts 
volume for the currently selected output.
Monitor Options
Apollo Twin MkII has monitor options 
that perform the functions of dedicated 
monitor controller. The monitor options 
are controlled using the row of six buttons 
at the bottom of the top panel when in 
MONITOR mode. 
The current state of the monitor options are indicated in the lower row of the options 
display panel above the option buttons. Available options are dim when inactive, bright 
when enabled, and unlit when unavailable. 
Note: Not all monitor options are always available. For speciļ¬c details, see the Top 
Panel Controls section later in this chapter. 
MONITOR
MONITOR
MONITOR










