... because in this low-budget drum machine there is a pattern sequencer, a dance oriented sample pack and some bass sound. You can idependently set the sound characteristics on each slot (1 button is 1 slot) and you can modify all of them in realtime. Pity that the sound quality put this cutie into the "toy" category.
The effects and the ability to manipulate the sounds make this drum machine stand out, compared to others of its generation, both from Boss and other brands. But the sample quality is pretty low.
Mine has a lousy silver paint job (from a previous owner), and I've never been able to get the bass synth function to work.