Q: What does the “Feed” switch on the back of the Radial Engineering Workhorse Cube 500-series chassis do?
A: The Feed switch allows you to internally cascade the output from the first 500-series module (left-most module when viewed from the front) to the input of the second (middle) module. The Feed switch on the second module routes its output to the input of the last (right) module. This lets you create a channel strip by installing preamp, EQ, and compressor modules into the chassis, and flipping the Feed switches on, all without having to use any external cables to jumper from one module to the next.
Mitch Gallagher explains it further in this video:
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