seriously, what the hell is it? Line six says my footcontroller has tap tempo for effects, but i dont know what it is and i dont know how it owrks or how to work it, can someone help?
you tap the switch four times and the speed at which you do that determines the rate of whatever effect its used for.
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^ Right. A properly set delay will be in ryhthm with the tempo of the song, so you tap the button to the tempo of your playing, and it adjusts the rate of the delay. This is also true for phasers, flangers or any other effect that repeats.
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e.g. a drum machine, that's when you use tap tempo too.

Flanger chorus phaser etc and abovesaid also utilized tap tempo