Some tuners don't have an on/off switch, they operate by detecting vibration. I have one like that, and I hate it. It works fine if you give it a good hard strum to "wake it up". But, if you're trying to play quietly, you often don't strum loud enough to trigger it. Mine will come on in some kind of "power save" mode first. The screen is super dim and makes you think the batteries are dead. And if you keep strumming lightly, it will go between off and that mode. But, if you strum hard, it wakes up and goes to its full-color bright display. So, you might have one that's sound-activated.
Can't help with the amp problem.
What could possibly go wrong?
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