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Possibly something else already pointed out/noted, but I'll fire it out there anyway just in case.
There's quite noticeable pitch issues with the triangle channel, particularly in the higher registers:
http://lunar.shakal.net/temp/tuneissues.nsf
In the NSF there's a square wave layered with the triangle wave, both playing identical notes so that you can hear the pitch difference. Is this something that's potentially fixable, or is it inherent to the triangle wave/2a03 mechanics (what with it being primarily used for bass and all)?