replaced unrelated valve tag with vacuum-tube
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Your Uncle Bob
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What is a buffered effects loop in a guitar amp?

I've just purchased an Orange Rocker 15 combo valve guitar amp and one of its features is a

valve driven effects loop

also referred to as a buffered effects loop.

What does this actually mean? I'm familiar with the "send/return" nature of effects loops but I've not come across the term "valve driven/buffered effects loop" before.