outputing on mpc

just completed my first legitimate track, and I outputed the audio through the outs of the mpc into a music interface usb box to my mac....the sounds are nice and grimy, but I had a few questions...should i route the output of the mpc through a mixer and then to the interface? also how do u guys sychronize your audio whether it be coming out of your mpc or from another computer or wherever else?


much love,

ian