There should be two prominent message boxes (or buttons if you prefer), one that causes the patch to jump to the "initial" frequencies (the harmonic ones) and another that starts the slide into two separate tones. The frequencies of the partials should change in time like this:
and sound like this.
For extra credit, rather than sliding the even partials to a new pitch, give them a vibrato (gradually coming in starting after 3 seconds or so) and then a bit later, make the vibrato fade back out. You should hear the sound split in two, and then fuse back together into one. To sequence the appearance and disappearance of the vibrato, you'll need to use a "delay" object, which you should look up on your own. The result should sound something like this.
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