The blue on on the floor is a multi effects unit, I can make echoes and digital sounds, there;s close to 100 different effects on it. And the big black and red one is a looper. I play something and then press a pedal, and it loops what I just played. It can also be used like a mini recording studio, but that's not how I use it. I use it to make loops in a live on the fly situation. All my guitar jams are improvised, I never know what I"m going to play when I start. That's part of the fun for me, I never play the same thing twice!