I *knew* some pedant would witter on about about the IDE devices and the RAM
But those are ALWAYS potential variables.... you can change 'em if you wish, they're not part of the MPC4000's own hardware, it just has sockets and bays where you can fit them if you wanna.
Some nice dealers pre-fit good ones for you.
Also of course, there a 4 optional expansion cards for the MPC4000.
(The FX board, the ADAT I/O board, the S/P-DIF I/O board, and the 8 analogue outs board).
Looks to me like most MPC4000s leave the factory with only the FX board as standard..... but you can buy and install any or all of them separately if you wish...