I have a Mpc 2000xl. I also have a small fast track m-audio. My bx5a monitor speakers the grey and red wire is connected to that. There is a guitar symbol in the back of my fast track m-audio. So what i did was connceted the 2 cables that i had. Andcable in the back of the mpc 20 00xl where it says phone. Than the other plug saaaaaaaa

there should be some kind of main l/r out or control room out on the mixer. that'll plug right into the bxa's.

check to see if your in monitor mode, seems like yout not

These speakers have a history of being blown if played too loud. Apparently the higher quality CX version are reliable. If the lows are what is crackling, the voice coils are probably cooked causing it to drag the pole pieces.

Check if the Mbox2 has an echo setting that echos the audio from its input. If you want the audio to loop through the PC then it will have to echo there instead. Check that in "Sound and devices" of the PC are all set to transfer via the MBox for voice and playback instead of the internal PC audio system.

try letting it sit for a few minutes. That worked most of the time with my xl

Data Compatibility
MPC1000: SEQ, WAV, PGM
MPC2000/2000XL: SEQ, WAV, SND, PGM (Most parameters of PGM file can be loaded.)
MPC4000: SEQ, WAV, PGM (DRUM program only. Only note assign and tune are loaded.)
MPC3000: SND (THRU Computer)
Z4/Z8: SEQ, WAV, PGM (DRUM program only. Only note assign and tune are loaded.)
S5000/6000: WAV only (THRU Computer)
S1000/3000: No compatibility

Make sure you do NOT have a monitor speaker that is active! If you have a monitor speaker, it is POSSIBLE that there is a SUPERSONIC feedback going on that you cannot hear. This would saturate the system and distort your recording. Studio mics have a lot of gain and a wide response.

Follow this diagram.

http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=hum_sing_sing_1vol_1tone_5w

Have you tried formatting the disc using your MPC 200XL?