This pedal combines optical/harmonic/Uni-Vibe-style "wobble" effects with reverb. It also features a tube-like saturation boost effect that can be adjusted with the Grain knob. This allows for a wide range of sounds, from subtle distortion + reverb, to reverb + tremolo, to distortion + tremolo. Each effect is of high quality on its own. * Holding down the Tap button also activates a "double speed" effect. Also, I'm a bit of a "tremolo fanatic"... Tremolo, unlike delay, doesn't have a "reverberation" effect; it's just a "wobble" applied to the sound (the effect always cuts off with the sound). However, by combining it with reverb, this pedal allows for a very unique expression: "reverberation of the wobble," where the wobble's after-effect continues like a delay. * The original price was around 38,000 yen, and this item is almost new. It's versatile, high-quality, and a great all-around pedal, so please consider it if you're interested. Tremolo Vibrato Reverb Booster From the manufacturer's description: You can select optical tremolo, harmonic tremolo, and vibe, and by adding reverb before the modulation, you can create the effect tones of a vintage silverface amp. Furthermore, the GRAIN control adds tube saturation.