I have a hi-lo damping switch on my rockerverb 50 head and It must be there for some practical reason, so what gives?
It changes the sound, press it and see what it does, if you like it keep it pressed down, if you don't then stop pressing it...if you can't tell a difference then stop worrying about it.

There's no point asking what it does, it either makes a noticeable difference or it doesn't - and if you can't hear it then people telling you what it's supposed to do isn't going to change that fact.
Actually called Mark!

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People with a duck for their avatar always give good advice.

...it's a seagull

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i wanna see a clip of a recto buying some groceries.