Does anyone know what the effects Children of Bodom used in the warm-up exercises that made their guitars sound like pianos?
Take it to Guitar Gear and Accesories.
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Excuse my stupidity , but what is a urethra ?

Im guessing anus.
assuming you're question is valid and you're not confusing their guitars with their keyboards, then i dont know. my guess would be that if theres piano sounds coming from a Bodom stage, its probably comin from the keyboard.