Isn't there a way to change the sound effect you're using while playing the guitar, without having to stop to turn a knob on an amp?
If so, what would this piece of equipment be called?
Or a built-in effect.

Never forget the possibility of a trick question.
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tl;dr How does one safely remove the smell of a corpse from a banjo?

Would you run down past the fence?

Tell us, is the black box lying?

This thought has never crossed my mind! OMG!

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it's called a stompbox? if you don't have built in effects on your amp that's how that rolls.
or if you have built in effects you can get the footpedal that controls your digital modeling like the sanpera or the vox valvetronix pedal and do it that away.
Jumping on dat gear sig train.
PRS Hollowbody II / BKP Warpigs
Strandberg OS6T / BKP Aftermath
Strandberg OS7 / Lace Poopsticks
Skervesen Raptor 7FF / BKP Warpigs
Skervesen Raptor 6 NTB / BKP Juggernauts
Hapas Sludge 7 FF / Hapas Leviathan
Anderson Baritom / Motorcity Nuke BKP Sinner Anderson H2+
Warmoth Baritone / BKP Piledriver
Ibanez Rg2120x / BKP Nailbomb

Blackstar ID:Core Beam