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,→Boosts vs. Gain
But before moving on, depending on the length and type of cable you use between pedal and amp, you may find you get a better SNR by using max output on your boost. Try it both ways - make sure when you compare that you are getting the same distortion saturation so you don't have a false comparison. In general, the output knob of a boost pedal should be a simple transparent amplifier, having no bearing on the tone of that device.
You may have other reasons to turn up the volume/output on a boost pedal - where you are using the unboosted amp tone as one tone and the boosted tone as another, switching between them the same way as switching channels on an amp. In that case, you should use that as you please rather than working inside of a meaningless set of rules.
=== Boosts and Frequency Response ===