Damn. As someone who has owned lots of gear, I REALLY miss my 4000 and missed out on multiple chances to get it again at a cheap price. I keep looking and feel like I can find one again.
I have jumped shipped and use a Live 2 as my main machine... While it is great and has some features that are amazing (manual chop is the best chopping tool i've used). I miss the 'sound' and 'feel' of the 4000. I am looking to get one again, but I honestly dont know how much I will actually use it, but I know it's a special piece of gear that has its place. I remember the 4000 having some killer swing and swing that could be applied in real time (not sure if another MPC can do this).
I feel like functionality and workflow wise, the Modern MPC's are definitely a step up and evolution of the MPC. But the 'sound' does kind of feel lackluster, I know it can be fixed in Post, but out of the box it just sounds so 'neutral'. I probably need more time to dig and master the modern MPC to get to the level I was at with the 4000, but I do miss that 4000 and wish I never sold it.
On that note, whoever here has the 4000, dont sell it, i'm looking back at gear I wish I never sold and am slowly trying to get them back. I got my Asr10 (will NEVER sell this), got an ASR X (extremely slept on), and am looking for a 4000 (feel like i'll find one eventually) and SP12 (will probably never get one again due to price). Even though i'm not yet there with the Live 2, I feel like this may also be a forever piece of gear because of the sheer power/portability it has. I've dreamed about being able to make beats in bed, on the plane, at the park, etc.