Yes the JJ OS has got a better USB management: Now you can enable and disable the USB function of the MPC itself without pulling plugs and stuff like that. I suggest you to try out that OS to check if the proble remains. OS 3.06 is for free. http://www7a.biglobe.ne.jp/~mpc1000/
beats_by_cav said:Any word as to whether version 3 or 4.xx of this Japanese OS fixes the USB issue?
Tell me if you've experienced this: when I connect my 1000 to the PC via USB, I am able to transfer files to/from it fine. However when I disconnect the device in windows and try to go back to songmaking, it remains on the USB connection screen, leaving it actively frozen.
I talked to Akai tech support and the guy was able to replicate it on every MPC 1000 he could find so it's a definite defect of some sort. But whether or not Akai will fix it is another story. But if this Japanese OS addresses the issue then that may be an alternative.