iConnectivity iConnectAudio 4+ Owner's Manual page 29

Enabling USB mixer Destination Busses – The USB Mixers are not enabled in the
+
iConnectAUDIO4 's factory default set-up. Since most DAWs and other software
programs have mixing built in (and the factory default is intended for use with DAWs),
they aren't needed.
When you do need the USB1 or USB2 Mixers, for example in a live situation, the way to
enable them is to select 2, 4, or 6 (anything other than 0) "Mixes to outputs on USB1
[and/or USB2] domain" as shown below:
Port Information - On the two USB Device Jacks, enable/disable Mac/PC and/or iOS
support; and set the maximum number of input and output channels available (when
they're enabled in the Mixer Information section).
The number of Analog Jacks is fixed, of course: 6 outputs (4 Analog Out Jacks + 2 for
Headphone Jacks 1&2); and Analog In Jacks 1-4.
Note that the names of the devices can be edited.
v.1.0
29