Boudoir Guitar
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No they don’t. Loads of people much prefer the sound of timebased effects in front of an amp.Time based really has to be in an fx loop.
If you amp is doing anything other than getting a fully formed signal to amplify clean and flat it’s going to change it radically and almost always for the worse.
You definitely want to have at least your reverb pedal on its own isolated power (you could just give it its own wall wart and use the one spot for everything’s else).
Pedals with internal charge pumps are also known to sometimes cause noise in downstream pedals, but that’s more of a strange whine than a buzz/hum.