Apollo 8 Hardware Manual Front Panel 19
(21) Monitor Function Switch (FCN)
This is an assignable switch that can be configured to control one of three monitoring
functions. The function of the switch is configured with the FCN SWITCH ASSIGN menu
the Hardware panel within the Console Settings window; see the Apollo Software Manual
for details.
The amber LED within the switch flashes when the monitoring function is active. The
function is toggled with the switch is pressed again. The available functions are:
ALT 2 – Selects the Alternate 2 monitor speakers. The monitor signals are routed to
outputs 3 & 4 instead of the main monitor outputs, and the Monitor Level Indicator
(#23) is amber instead of green when ALT 2 is active.
MONO – Sums the left and right channels of the stereo monitor mix into a monophonic
signal. The Monitor Level Indicator (#23) flashes when MONO is active.
DIM – Attenuates the signal level at the monitor outputs by the dB amount set in the
Control Room strip within the Console application. The Monitor Level Indicator (#23)
flashes when DIM is active.
Note: When more than one Apollo interface is connected in a multi-unit configura-
tion, the FCN switch is operable on the designated monitor unit only.
(22) Monitor Level & Mute Knob
This rotary encoder serves two functions. Rotating the knob adjusts the monitor output
level, and pressing the knob mutes the monitor outputs.
Monitor Level
Rotating the knob clockwise increases the signal level at the Left & Right Monitor
Outputs on the rear panel. If ALT monitor outputs are configured and active, this knob
controls the signal level at the ALT monitor’s line outputs.
Although this is a digital control, the Left & Right Monitor Outputs volume is attenuated
in the analog domain, after D/A conversion (digitally-controlled analog volume). This
method provides the utmost monitoring fidelity, in contrast to digital volume controls that
reduce levels by truncating the digital word length (aka “dropping bits”).
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