Re: Akai MPC500 vs XR20
different functions.
mpc - sample based. create samples and upload them to the mpc. download countless free beats and load them on the mpc. assign your own bass drum, snare drum, etc sounds to the pads and tap out your beats. record your guitar, or whatever instrument, on your computer or recorder, and then transfer that to the mpc.
xr 20 - all the sounds are onboard. you cannot add your own drum sounds. you cannot add vocal samples. you cannot add synth sounds. you cannot transfer anything to it. it is a couple hundred bucks cheaper for a reason.
the mpc is a complete music production device, with the ability to perform live. the xr 20 is a beat making machine that can be used live. to complete a recording, the xr 20's beats need to be uploaded onto a recording device. the mpc has sampling, the xr 20 does not. the mpc allows you to arrange your complete compositions, the xr 20 allows you to arrange your beats and synth tracks made entirely of xr 20 sounds. the xr 20 is a piece of the puzzle, the mpc puts the puzzle together. they both allow you to make beats - the xr 20 is a closed system, the mpc is completely customizable.
i'd get the mpc.