ART Pro Audio DPS - DI/O Preamp System - Manual (Page 13)

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¼” INSERTS (REAR)
The DPS has 2 channel inserts that are routed just before the digital
converters. The 2 female TRS jacks can be used to send the DPS’
analog signal to an external processing device, and then return the
effected signal to the digital converters. The RING of the TRS is used
to send the signal out, and the TIP is routed to the digital converters.
One could also simply plug the output of a device directly into the
insert jacks to directly go into the converters.