Audio Developments AD255 - Manual (Page 22)

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Line-up tone, when selected (9), replaces the normal signals on the main output.
The frequency of the line-up tone may be selected between 1kHz and 10kHz (11).
Line-up tone is calibrated on the (PPM-scaled) meters to ‘0’, giving a line-output level
of 0dBu with the output faders set to maximum.
The auxiliary output signal levels are controlled by two potentiometers (3).
Separate Penny & Giles faders (5) are employed for maximum flexibility and control of
the main left and right output signals.
The remaining controls are associated with headphone-monitoring of signals from the
mixer - internal signals (DIR) or return (RET) may be selected (12): these signals may
be in the L-R domain or the M-S domain. When switches (12), (13) and (14) remain
unselected the main-output signal from the mixer appears on the headphones. If
L (13) is selected, the left-output signal appears on both ear-pieces; if R (14) is
selected, the right-output signal appears on both ear-pieces. If switches (13) + (14)
are selected, a matrix will enable mono compatibility to be assessed on the left ear-
piece and out-of-phase components to be checked on the right ear-piece. When
working entirely in the M-S domain, the matrix will transform the mixer output into the
L-R domain for monitoring purposes. Selection of RET (12) will allow these functions
to be performed on a return signal. Selection of AUX MON (4) allows these functions
to be performed on the auxiliary output signals accordingly. For example if L (13) is
selected, the auxiliary 1 signal appears on both ear-pieces. The level of the monitor
signal is controlled by potentiometer (15).
A mono mixdown of the main, stereo output from the mixer is available and its level is
adjusted by MONO (16).
The signal from the internal microphone (17) replaces any other signal appearing at
the outstation when routed via EXT (19) - the level being set by preset GAIN (18).
SLATE (20) allows the mixer operator to ADD a voice signal to the main stereo output
together with a low-frequency identification tone (100Hz).
When PFL is selected on an input channel or when the outstation wishes to
communicate with the mixer operator (by grounding pin 6 on the multiway), logic
changes the signal on monitor output accordingly.