Using Aux Sends and Returns
AUX 1 | PRE |
| 0 |
∞+10
AUX 2 | POST |
| 0 |
∞+10
AUX RETURNS
STEREO
0
∞+10 AUX RET.1/2
MUTE
3/4
L 
R
BALANCE
0
∞+10 AUX RET.3/4
MUTE
3/4
L 
R
BALANCE
The MPL 1204’s two Auxiliary sends allow you to combine the signal from multiple channels and send the resulting mix to external devices such as effects processors. When an Aux send knob is at its 2 o’clock “0” position, the signal is routed with unity gain (that is, no boost or attenuation). As it is turned clockwise from the 0 position, the signal is boosted; as it is turned counterclockwise from the 0 position, it is attenuated. Aux send 1 is
The MPL 1204 also provides two stereo Auxiliary returns. These allow you to return signal from outboard devices in stereo pairs. Each of the stereo Auxiliary returns is somewhat similar to a stereo channel, except that a signal being brought into to a channel can be equalized if necessary and optionally sent on to other outboard devices (via Aux sends or channel inserts). In practice, you’ll probably want to use the Auxiliary returns to bring in signal from connected effects processors. If the effects processors have stereo outputs, they should be connected to both the left and right Aux return inputs so that their stereo integrity is retained. If they have mono outputs, you can route them to either the left or right inputs and then use the Aux return Balance control to adjust the relative level of each paired signal. In this way, you can actually connect up to four monophonic devices to the MPL 1204’s Aux return section.
When an Aux return Balance knob is placed at its center (detented) position, both the left and right signals are at equal strength. When moved left of center, the left input signal remains the same but the right input signal is attenuated; when the knob is moved right of center, the right input signal remains the same but the left input signal is attenuated. When placed fully counterclockwise, only the left input is heard (panned hard left); when placed fully clockwise, only the right input is heard (panned hard right).
Signal arriving at the left Aux return input is automatically panned hard left and signal arriving at the right input is automatically panned hard right. The
MPL 1204 Aux return jacks are unbalanced stereo inputs, with the tip carrying the left input signal and the ring carrying the right input signal (the sleeve carries common ground), as shown in the wiring diagram on page 12 of this manual. Insertion of a monophonic 1/4" jack into an Aux return will result in the incoming signal being automatically routed to the left input only (and therefore panned hard left).
The signal arriving at each of the two stereo Aux returns can be routed to either of the two bus pairs (1/2 or 3/4) with the use of the associated Aux Return bus switch (as described in #2 on page 6). The signal can then be routed to the Master and Control Room outputs by pressing in the associated bus L/R switch (as described in #14 on page 8). Note that Aux Returns cannot be soloed and so cannot be monitored over headphones.
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