I have owned and used all the MPC's and even the Linn 9000, and the 4000 is my favorite. It is by far the most flexible MPC, you can integrate it into computer studios easily with impressive results that let you take your music to a higher place, technologicaly speaking. That said, I like the sound of my MPC 60 the best but I can't do nearly as much with the machine. 20 seconds mono

kinda sucks. Bottom line if you can sell your 3 and get a 4 do it. I wouldn't have said this 2 months ago, but since they dropped the new OS I fully back the 4k like no other. good luck on your quest for beats