
ok, when you RECORD in the MPC, you have to set the record length, it is 10 seconds by default! if your song is longer than 10 seconds, set the length accordingly.
if you have the stock 16MB internal RAM, your recording time will be limited to a minute or something. with the 128MB upgrade you have about 12 minutes of stereo sampling time, which is usually enough to record the whole track into one stereo wav file....
all the above is about recording INSIDE the MPC so you can then transfer the resulting wav over the USb into your computer.
you can of course, as Nicole suggested, simply play the MPC output into the computer and record with the PC. the procedure for recording on the PC will vary widely for everyone involved depending on your equipment and software!
but basically the procedure is the same, for example, here's how on the macbook:
you need a converter cable that does 1/4 inch to 1/8 inch. basically the line outs on the MPC plug into the line in port on your laptop. you go into the Utility menu and start the Audio-MIDI application. set the audio portion to input from your line in jack, and not the built in mic.
then start up Garageband. create a audio track, open its properties and make sure it is set to get its input from the line in. you can choose to monitor this track, then when you hit a pad on the mpc, you should hear it in garageband (visually you will see it affect your levels as well, adjust it so your input isn;t in the red).
now you just hit record in Garageband and then hit play on the MPC. when the song is over, stop recording, then listen back. if it sounds good, great! iotherwise you will need to adjust levels and try again....