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4 - The PatchMix DSP Mixer
Main Section
E-MU Digital Audio System
35
Auxiliary Effects & Returns
f
The Wet/Dry mix 
setting in the effect 
should normally be set to 
100% when the effect is 
inserted as a sidechain 
effect. This is because the 
Aux Return Amount will 
control the wet/dry mix.
The section immediately below the TV Screen is where you assign the Auxiliary Effects. 
In a traditional mixing console, auxiliary effects sends are used to send part of the signal 
to outboard effect devices, then return the effected signal back into the mix using the 
effect returns. This is called a sidechain routing because the aux signal takes a detour 
through the effects before being summed back into the main mix.
Sidechain effects are usually effects that you might want applied to several channels, 
such as reverb. Effects such as EQ and compressors are usually NOT used as sidechain 
effects because they can cause unpredictable results when returned to the main bus.
You can also use the Auxiliary Sends as two extra mix buses. By turning the Aux Return 
amount all the way down and dropping an Insert Send into the chain, you can send the 
Auxiliary bus to any output you wish. See 
Sync/Sample Rate Indicators
The Sync/Sample rate Indicators show the current session’s 
sample rate and whether it is internal or slaving to an external 
source. The LEDs indicate which sample rate is currently in 
effect. If an external source is being used, the Source display 
reads “EXTERNAL”.
When slaving to an external master source, the clock may drift 
slightly or change dramatically (i.e. abrupt sample rate change 
or unplugging of physical master source). PatchMix DSP is 
tolerant to minor drifting within the supported rates of 44.1k, 
48k, 88.2k, 96k, 176.4k, but if the sample rate drifts out of 
this range the “LOCKED” LED will extinguish.
If the external clock source makes a radical sample rate change from the lower rates of 
44.1k/48k to a higher rate or between the rates of 88k/96k  and 176k/192kHz, the 
hardware automatically switches to internal 48kHz clock until the proper external clock 
is restored. The “LOCKED” LED will be off and the two units are NOT synchronized. 
Always check the “LOCKED” LED when using an external clock source.
Main Bus
Side
Chain
Input
Fader
Mute
Output
Return
Amount
Send
Amount
Input
Pan
Aux
Amt
Aux
Amt
Aux Bus 
Sidechain Diagram
(Post-Fader Aux Sends)