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Hehe, you know, I understood only a half of the technical terms you used in the post above. It's more than 14 years ago since I stopped to play the piano, and since then I forgot almost all terms of music...*sigh*
Anyway, you don't need to know much musical knowledge when creating music in trackers. Rather almost pogramming them . Though without a tuned hearing and a sense of the music you won't be able to produce anything interesting, either.
Unis 669 Composer supports up to 8 simultaneous running lines (or channels, like they're called technically there), but I used only 4 of them, 3 for playing the instruments and 1 included just for having a complete "channel-count" (an Amiga MOD uses 4 simultaneous channels). This "song" was only my first try on the composer. The next one will be very different, be sure of that.