This little box is unbelievable! It will give you the highly sought after 80's rhythm and drum sounds not possible with a digital sample drum machine. Why? Because it's analog! The sounds that are generated from the Volca Beats are made with synthesizer occillators rather than digitally recorded samples of drummers playing real drum sets. This little drum machine does not sound like an alesis sr 16 or boss dr. rhythm. It's more like a warm analog kind of click and pop sound which is very pleasing to the ears. And when you sync it with your synthesizer's arpeggiator and record a track, a very vintage and magical sound is achieved! The 8 preset sequences stored in it's memory are all you need to make great sounding rhythm tracks, all you need to do is to change them using the "step jump" feature and if you don't like the presets, you can erase them and program your own instead. And the two stutter knobs will change the sounds into things you've never heard before. The Volca Beats. has a midi input so it can sync with a synths midi out clock ,but a little trick I learned: if your synth and drum machine won't sync with midi, just set the tempo on both devices to the same value and turn them on at the same time, it works, believe me. The Volca Beats operates on the principles of step sequencing; 80s technology to the core! The computer records 16 steps or events and then plays them back in perfectly timed order as it loops them over and over, the result is a mechanical syncopated rhythm sound that is very pleasing to hear. Back in the day I had a roland tr-808 which had a sound similar to the Volca Beats, as I bought it so I could have metronome timing when I played my electric guitar, and I did a STUPID thing; I traded it to a friend of mine for an old marshall combo because I was not into electronic music at the time. The tr-808's are as rare as the jupiter 8 synths, neither of those exist on the planet earth today! The volca beats will play forever if you put AA batteries in it, specs say you can run it for 10 hours on batteries, but I think it's more, cause I've been using my volca beats like crazy and the batteries haven't run down yet. It does not come with an ac adaptor, but the specified ac adaptor is the korg model KA-350 which is the same one that comes with the ms-20 mini synth or the microkorg xl+. The drum pads are touch sensors and it will take a little getting used to because they don't physically move. It is possible to get rolls and fills when the sequences are played back so that way it won't sound like the same repeating pattern over and over again, But I'm not going to give away my secrets now because in time you too will figure out how to get fills and rolls from your own Volca Beats if you just learn what all the controls do. And the Volca Beats has an old style smpte time code output that will sync it with the two other korg volcas as well but that's another story. You need this little drum machine, that's all there is to it! You won't want to use your alesis sr 16 or boss dr. rhythm again after you find out what this little gem can do! But as you will soon find out, these are difficult to aquire because the back order time for these is months at a time, because everyone in the world wants one of these! This is an unbelievable price for something like this. I have three of them and I will not sell them or trade them for anything! Analog is back! Because it's the best.