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FamiTracker
I fiddled around with this idea awhile ago. This is made for 3.7, no idea how it'll sound in 3.8 beta. This is running at a much higher hz than yours is, but it's the same concept.
Originally I was thinking if you could make a sawtooth-like wave if you chopped the triangle in half, but then I realized the triangle turns off with a very quiet popping noise.
The noise in your .ftm is probably the closest thing the NES could do to mimic the periodic mode of the SN76489.
If you want to do something like this for real on the NES, the DPCM channel can generate an interrupt when it's finished playing, at which point you can do a Zxx and start a new wave. Blargg did a test that made kind of a sawtooth, combinding a DPCM downward ramp interrupted with a Zxx as needed. (Anyhow, it's kind of outside the scope of stuff you would want to do in a real game; and too specific a feature for FamiTracker because it would take custom code and careful DPCM sample design for each different kind of waveform you want to make.)
[quote=Rushjet1]I fiddled around with this idea awhile ago. This is made for 3.7, no idea how it'll sound in 3.8 beta. This is running at a much higher hz than yours is, but it's the same concept.[/quote]
The FTM plays really slow, as slow as what you will get in 0.3.0 using the same engine speed settings.
