I'm going to fold on this one for now. There are three reasons for me to not making an entry at this time:
1. The triangle wave seems to be handled more poorly at higher pitches when compared to IT2NSF (my Mysterious Song cover was severely affected when I got the wise-cracking idea to port that over to Famitracker since it used a triangle wave with that kind of pitch, and I have a version made with IT2NSF where the problem doesn't seem so severe, but I still don't fully trust it)... well, maybe I'm not fully sure on this one, but it seems like the pitch results don't match.
2. I don't think there's a DPCM pitch envelope feature, unlike IT2NSF's feature (actually handled via the "duty" feature). I like using DPCM pitch envelopes because I can pull off a mean kick with them for cheap memory, and since there's a 24KB memory limit, then that pitch envelope would be greatly beneficial here to save on both pattern memory and DPCM memory in general. I actually have a beta of an entry intended for this very compo that uses this feature.
3. Platform incompatibility with the tracker itself. I'm not interested in using emulation or bringing out my Windows laptop to circumnavigate this part.