This is the Neunaber EXP controller. When connected to a PC and used with the Neunaber Expanse series, it's a multi-effects controller that allows you to save two preset settings for the tones of four effects. Example of actual use: Channel 1 - Wet reverb…A) Short reverb, B) Long reverb Channel 2 - Shimmer reverb…A) Short, B) Long Channel 3 - Delay…A) Short B) Long Channel 4 - Chorus or Flanger…A) Subtle setting B) Wild setting I was using it in this way. It feels like a multi-effect unit, but the operation is like a compact effector. All the sounds are high quality and usable. I'm selling it reluctantly to downsize my effects board. Thank you. *The terminals that connect to the effects are loose and tend to come off easily. If you are concerned, please purchase new terminals yourself. It should be fine for live performances unless something unusual happens (I actually used it as is), so I'll let you know in advance.