Apollo 8 Hardware Manual Front Panel 17
(14) CLOCK Indicators
The clock source and status are displayed with these indicators. Either internal (INT) or
external (EXT) is displayed. The clock source is set within the Console application; see
the Apollo Software Manual for details.
Internal Clock
When set to internal clock, the INT indicator is illuminated white.
External Clock
Apollo 8 can use an external clock from the Word Clock, S/PDIF, or ADAT inputs. The
EXT indicator has two possible states:
White – When set to external clock and a valid clock signal is detected at the specified
port, the EXT indicator is illuminated white and Apollo 8 is synchronized to the external
clock source.
Red – When set to external clock and a valid clock signal is NOT detected at the
specified port, the EXT indicator is illuminated red and the internal clock remains active
instead. In this situation, if/when the specified external clock becomes available, Apollo
8 switches back to the external clock, and the EXT indicator is illuminated and white.
Important: When set to use any external clock source, Apollo 8’s sample rate must
be manually set to match the sample rate of the external clock.
(15) METER Indicators
These indicators show the current state of the Channel Level Meters (#12). The current
state is changed with the METER switch (#19).
IN – When IN is illuminated, the channel meters display analog input signal levels.
OUT – When OUT is illuminated, the channel meters display analog output signals levels.
(16) Power Indicator (UA Logo)
The Universal Audio logo illuminates when the external power supply is properly
connected to the AC outlet and the power input on the rear of the unit, and the Power
switch (#26) is in the up position.
(17) Sample Rate Indicators
These indicators display the current sample rate setting for A/D and D/A conversion.
The sample rate is set within the Console application or the host DAW; see the Apollo
Software Manual for details.
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