my favorite music tool that i don't have

I've always wanted a ''MP" even though i don't know what "MP" stands for........ANYWAY it's an electronic instrument that has 16 square buttons that make an individual sound. it's used to make beats using a steady process where you control the tempo.MP's are commonly used in the rap and hip hop business. I've always wanted an "MP" and there is still hope that i will get one soon.........