So I read a lot about how sample playback works on the master system, and I thought about trying it on the NES. I hope this is possible on real hardware, assuming the code can run 133 times per frame to get a sampling rate of ~8000Hz like this hacked module.
Although the envelope sequence length is quite limiting I made a kick using a pulse channel, setting the period to 8 and using fast volume writes. Also you can apply 2-bit volume control via PWM thanks to the 4 duty settings.
I'm not sure if this high frequency would get filtered on hardware though.
You can avoid the PWM slicing if you use a low frequency, reset the phase continually, and use duty 3 (which starts high, unlike the other duty settings). B00daW made a demonstration of this a while back actually, not with Famitracker though.
WOW. That's all done at 60Hz? I am truly interested. If this goes far enough, we will be able to recreate music from the Amiga on the NES. You already can on the Commodore 64 (With a few minor limitations)
Wow this is great quality for 4-bit sampling. I have to guess that there's a high sampling rate going on here. At least definitely more than just 8kHz.