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Unlike the Si Expression and Si Performer, the Si Impact does not have ¼" line inputs.  There are 4 stereo channels available on the mixer, they just are not assigned or patched by default. 

How To Assign and Use Stereo Channels on Si Impact

There are total of 8 stereo channels on Si mixers.  On all Si mixers, 4 are used for F/X Returns. These are usually ST 5 to ST 8.  On Expression and Performer, 2 or 4 are used for the 1/4" line inputs.  Seeing the stereo channels do not have a mic preamp, they can only be used for line level sources.  On the Si Impact, you can use ST 1 through ST 4 for digital inputs, such as MADI channels from the USB interface. 

This is how you assign the stereo channels to faders and patch input signal to them:

· On the Main Menu select Fader Setup.

· Select an open channel (or you can change any existing channel if you like).

· Under Assign Stereo Channels, select one of the unused stereo channels.  In this example, ST 1.

· Select Inputs and VCA.

​· Make the patch.  In this example, we are patching MADI channels 33 and 34 (USB audio return channel 1 and 2) to the stereo fader ST 1.

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