MIDI questions?

[Soul Shaker]

I am trying to midi an Akai MPC drum machine to a Korg Triton keyboard. I have been succesfull in getting them to work together ( Sequencers syncing up ). But, is there a way to midi the drum machine without having the sounds "spill" over on to the keys of the keyboard. For example, if I want to program a beat on the drum machine, then want to add sounds from the keyboard, on some of the notes, I am hearing the kick, snare, hi hat, etc. from the MPC over the sounds of the Triton ( If I turn the controller option off on the keyboard, I do not hear the sounds from the keyboard ). Please offer advice. I am new to MIDI and appreciate any suggestions.

Thanks,

Jeff