The MPC is a sampler sequencer, right? The Trinity isn't a sampler, is it? Because in that case it's like trading a sofa for a bed. It's a bad trade if you need a sofa, but a good one if you need a bed.
Check out second hand prices for all the equipments, and do the math, and you'll see if it makes sense..
I had a djx a alesis qudrasynth and the korg electribes...and the mpc 2000...I traded everything except for the mpc2000xl to get a trinity...and it was worth it
don't trade the mpc, the mpc and the trinity go together liek peas and carrots my friend...but the djx is bootleg, if you have trinity and an mpc you are in business to make some dope beats. holla