Hi, hope this can help you. On your triton extreme press global, then menu, then select the midi menu. set local control to on (because you are using the internal sounds from the triton), and set midi clock to exernal midi and recieve external realtime commands(because you are using the sequencer in the mpc). Now press exit and press SEQ. This will bring up the menu where you can choose what sounds will play on different midi channels. You will see 8 boxes with the word keyboard, this is the sound bank for that sound. The sound is BD grand piano. Just change this to what sound you want. that was midi channel 1, to have another sound play at the same time go to channel 2 and choose a different sound. Make sure you also have the midi tracks in your mpc set to midi channel 1 and 2. And you have to be in the SEQ screen on the triton to hear all the sounds when you play back your sequence on your mpc.