I purchased a used item in good condition two days ago at the Ishibashi Music Main Store, but I am listing it because I urgently purchased an amplifier that supports an effects unit. The BOSS RV-6 effects unit, which allows for a variety of reverb settings. - Model: RV-6 - Brand: BOSS - Type: Reverb Effects Unit - Input Terminals: A/B - Output Terminals: A/B - Control Knobs: Level, Modulate, Spring, Plate, Hall, Dynamic - Included Accessories: Box, Instruction Manual Thank you for viewing. There is no crackling or noise, but please understand that this is a used item before purchasing.