Gain adjusts the signal going into a piece of gear.
Volume adjusts the signal going out of a piece of gear.
One trick i use for the gain knob when trying to find an accurate direction of a convoy is to adjust the gain knob such that the signal clips (distorts) at the loudest part of the convoy. Generally though, gain can be thought of as a sensitivity knob. You are boosting the signal. Care must be taken not to boost it so much that it clips (unless that is desired.. like distorted guitars).
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