The Tentacle is a classic analog octave up effect. It is the very same octave from EarthQuaker Devices' Hoof Reaper pedal. Put it in front of another octave up and blow your amp's mind. Throw it in the effects loop of a delay and marvel at what happens. What' better? It has no controls! Nothing to worry about at all here, just hit the switch and go for it. The Tentacle is an analog octave up, the effect will become much more pronounced when using your neck pickup and playing above the 12th fret