The Part keys change between the different channels.
However, this won't necessarily make any difference to what you hear if you are playing via your sequencer.
You need to press Multi *once*. Then press Multi Edit. In this menu you can access all the important parameters, like Enable (which needs to be On), and make sure each Part is set to a different midi channel etc. This is also where you can select the Bank and Patch for each Part (toggle with the Part keys).
I might be slightly off here, as I don't have a C in front of me , but that the general idea.
Then make sure that your sequencer is transmitting on the correct midi channel for the Part you wish to hear.
Also - once you have enabled all the parts and set up the midi channels correctly, you can press Multi and Single together, and then browse the patches on each part exactly as you would in Single mode.
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