28. +4 / -10 Switch
This button, located on both stereo channels, is used adjust the
input sensitivity of the corresponding channels. This will adapt
the channel to external devices that use different operating
levels. If the input source is -10 dBV (consumer audio level), it is
best to engage the switch, allowing the signal to be heard. The
+4 dBu level is suitable for professional audio signals, which are
considerably higher than the consumer level. However, if you are
unsure of the source's operating level, we suggest leaving the
switch disengaged until you test the source's signal. You can then
engage if necessary (if the level of the input signal is obviously
too low).
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Digital Effect Section
29. Program Control
This control will allow users to select one of the 16 built-in digital
effects of the AM mixer. The effect names that correspond with
the numbers can be found on the top of the mixer's face, or in the
digital effect table.
30. Effects On Button and Indicators
Pushing this button will turn the built-in effect processor on and
off. When the effect processor is activated, the corresponding
LED will light up to indicate so. The uppermost LED is a
Peak indicator. This will light up when the EFX signal reaches
excessive peaks and should be lowered slightly. Please note that
unlike many other buttons on the AM mixer, the EFX ON button
will not latch down.
31. Parameter Control
Turning this control will adjust the one main parameter of the
selected effect. Each effect's adjustable parameter can be found
within the digital effect table.
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32. AUX Return Controls
These controls adjust the signal level of audio fed through the
stereo AUX Return inputs to the main mix. The "To AUX 1" control
found on the AUX Return 2 control adjusts the pre-fader level
of the signal from the AUX Return to the AUX 1 Send mix. The
button that accompanies the AUX 2 Return control allows users
to determine whether the signal will be sent to the main stereo
mix or the ALT 3-4 mix. When nothing is connected to the AUX 2
Return Input, the AUX 2 Return Control will be used to control the
signal from the built-in effects.
33. Ctrl Room / Phones Control
This control is used to adjust the audio level of the Control
Room feed, which is sent to both the Control Room outputs
(for monitoring, acting as side fill or other purposes) and
Phones outputs (to be used in conjunction with headphones for
monitoring).
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34. Control Room Source Buttons
These buttons allow users to select the source signals for the
Control Rooms / Phones mix. Users are able to select from the
Main mix, ALT 3-4 mix or the 2T Return mix.
35. AUX Send Controls
These controls adjust the final level of their corresponding AUX
mixes (as taken from the AUX controls on each channel strip).
This audio is then sent to the AUX 1 and 2 Send outputs found on
the top of the mixer face.
36. 2T / USB Return
This rotary control adjusts the incoming level from the RCA 2T
input connectors as sent to the main mix (and Control Room/
Phones, if selected in the Control Room Source section). Unique
to the AM1204FX RW , this control is also used as the incoming
USB level. All incoming signals through the stereo USB audio
interface will be controlled by this control.
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AM1204FX RW