Yeah it has 3 'pattern' sequencer but the third you have to buy it (Boss recommends the SR 202); or maybe you could use the Yamaha CS2X. It's confusing because the first two sequencers are the internal drum and bass. Basically what you do is take 'patterns' of drum and/or bass and combine them with third pattern from a sampler and build songs from the patterns. The knobs are real time. In my opinion this drummachine is easy to use and learn as a beginning machine or if you just want to make music as a hobby. I think the price tag is too high for this unit. i would therefore recommend it with reservations. Oh yeah personally i would like more drum sounds also; unfortunately this unit doesn't seem to be expandable (someone can correct me if i am wrong).