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The DPCM channel is used to load samples. It's mostly used for sound effects but also for drums (like in most konami games). Some nsf player let you rip sample from nsf, or you can find them on the net. You can also import your own sample.
You may also find [url=http://famitracker.shoodot.net/wiki/index.php5?title=Importing_DPCM_samples]this page helpful.
Since the question has now been answered, I'll go ahead and lock this. Feel absolutely free to ask more questions in the future, but do make sure they haven't already been answered either here or in the Wiki. Thank you.
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I record (some) NSFs on hardware. Feel free to [url=http://www.famitracker.com/forum/posts.php?id=3633]request a hardware render.