The Tentacle is an effect pedal that simply adds a one-octave-higher tone to the original sound. It's similar to what you hear in our Hoof Reaper. We developed it because we received many requests from our customers for a simple octave pedal with no knobs or controls. There's no doubt that it can be used with any other effect pedal, depending on the user's ideas, and the possibilities for sound creation are endless! When used with a guitar, a more accurate octave can be obtained with the neck pickup and at the 12th fret or higher. https://www.earthquakerdevices.jp/tentacle ◯ Purchased a brand new, genuine domestic product. ◯ Operation confirmed. ◯ Used only a few times indoors at home. ◯ Has not been used with shoes, nor has it been attached with Velcro. ◯ Accessories: Yamaha Music Japan warranty (official importer) / Safety Precautions / Instruction Manual / Sticker / Jamie Stillman card / Pick / Effect pedal bag