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It will have a HUGE(and bad) effect on the amp's performance. Try running a mile while holding your breath - then you'll understand what the amp is going through with a poor ground.
Boyle's Law explains how the water pressure increases as you hold your breath. For example, the deeper a diver goes, the higher the pressure and the harder it is to hold your breath.
The duration of The Trigger Effect is 1.57 hours.
The duration of The X Effect is 1800.0 seconds.
The duration of The Providence Effect is 1.53 hours.
The duration of Blackout Effect is 1.5 hours.
The duration of The Jake Effect is 1320.0 seconds.
The duration of Zero Effect is 1.93 hours.
The duration of The Twins Effect is 1.78 hours.
The duration of Nostradamus Effect is 2700.0 seconds.
The duration of The Ketchup Effect is 1.5 hours.
The duration of The Butterfly Effect is 1.88 hours.