API Audio 1608 Recording Console - Manual (Page 30)

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5.1 Program Bus Output Masters
The controls for the 268B Left and Right Program Bus Output Masters (PGM L and PGM R)
function as follows:
Together with the 440B Stereo Master Fader, the Program Bus Output
Master section of the 268B provides a fully featured stereo master
channel. Features of this master channel include:
 On/off switch
 Trim control
 ACA calibration
 Output Booster calibration
 Switchable balanced insert
 Balanced, line-level outputs
The Program Bus Insert Send ACA jacks are the pre-fader Outputs of
the Program Summing Buses. They normally feed the top of the fader
and are half-normalled to the Program Bus Insert Return jacks. The
Program Insert jacks feed the Master Fader and Program Bus Outputs
by engaging the Program Bus Insert switch. The Program Summing Bus
outputs will feed the Program Master fader unless the Program Insert
button is engaged. This allows insertion of external processing
equipment pre Program Fader.
ACA CAL (trim-pot): The trim-pot calibrates the output of the
Active Combining Amplifier
BSTR CAL (trim-pot): The trim-pot calibrates the output booster
TRIM: Controls the output level of the Program Bus (ACA)
 -5.5bB to +1.5dB
ON: On/off switch for the Program Bus Output Master
PRG INS (Program Insert): Activates the Left and Right Program
Insert Return
 The Program Insert Send is fed pre-fader from the output of
the Program ACA
 The Program Insert Send is always active
 The Program Insert Send is a balanced, line-level signal
routed to the PROGRAM BUS INSERT SEND (ACA OUTPUT)
1/4” tip-ring-sleeve jack on the rear panel
 The Program Insert Return accepts a balanced, line-level
signal from the PROGRAM BUS INSERT RETURN (FADER
INPUT) 1/4” tip-ring-sleeve jack on the rear panel
 The Program Insert Return is located post-ACA and pre-fader
 The Program Insert Return is active only when the INS button
is engaged