Audio Developments AD149 - Manual (Page 60)

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Line-up tone, when selected, replaces the normal signals on the main, L-R output (15)
and on the auxiliary outputs (16). The frequency of line-up tone may be selected
between 1kHz and 10kHz (13). Tone is normally continuous on L & R and on
AUX 1 & 2 or interrupted tone, in 3-second bursts, may be selected to L and AUX 1 by
switch (14). By the simple addition of two links, cutting a track and removing a
through-pin on the right-hand PCB, the user may (more logically) place the interrupted
tone on the R and AUX 2 outputs. Line-up tone is calibrated on the (BBC-scaled)
meters to PPM4, giving a line-output level of 0dBu with L & R and AUX 1 & 2 controls
set to maximum.
Alternative calibration levels are possible via the internal preset.
RIGHT-HAND PRINTED CIRCUIT BOARD
FIG 13