The Akai XR20 Beat Production Station is a self-contained music-making command center, ready to pick up and go wherever and whenever the idea for your next song pops in your head. Able to operate on an AC adapter or battery power, the XR20 packs over 700 sounds from drums to synths generated with 32-note polyphony for an immersive experience with plenty of depth. Not just for beats, this tiny titan also employs Pattern Play mode which allows assignment of different phrases to pads, and with the added mic output, you can get a song up and running while you're still on the bus.