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FamiTracker
I have two observations about popping on the triangle channel.
1. When halting the triangle in high registers, you get a very prominent pop. Below about C-3 I don't notice the pop any more, probably because once the angle of the discontinuity gets low enough it's not very audible. It happens in the note onset too, but doesn't really sound like a problem there, since the pop gets covered by the actual sound of the triangle.
This is probably accurate to the original hardware's sound, but it's a fairly unpleasant accuracy. I don't think stopping on a zero crossing would help, since it's a discontinuity of slope rather than position. Maybe a volume ramp would help? Or... maybe nobody else cares about this.
2. When beginning playback, the first note of the triangle sometimes has an extra little jog on it that makes a very bright pop (not like the dull one on onset/halt). This doesn't happen every time; if I save as WAV multiple times I get different results. Maybe it's jumping from 0 to the last triangle counter value on the first note only?
It doesn't matter if this first note is on the first row or somewhere in the middle of a pattern.
I've attached two examples, and the FTM that produced them.
IF you use a C00 command (I use 0.3.5. sue me, I have C00) it also makes it pop. I thought I was the only one that noticed it. i can get pretty annoying at times.
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Every tracker version has C00 to halt the track completely.
This also happens when you use the Zxx command in the DPCM channel (because you're directly editing the delta counter & affecting the triangle's volume).
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The first pop is caused by the wave being halted, which generates some harmonics (and can be seen on the spectrum analyzer). This is what happens on a real NES so I don't think I'll do anything about it.
The second pop is caused by the wave being reset to zero, and this on the other hand does not occur on a real NES; except for when doing a hardware reset. So this might be worth a work around if you find it irritating. All channels are reset when starting/stopping the player to clear everything to a known state. So if the counter was already at zero then no pop will be audible.
Usually, even though the triangle waveform position starts and stops abruptly, FamiTracker does a decent job of smoothing the difference out with a low frequency transition from the triangle's position to the "center" position.
Except not the first time a triangle note plays in a song. I can still see the same low frequency transition happening when I look at the waveform, but there's an abrupt click added to that.
To work around this I play a dummy triangle note in a short intro frame, and then skip into the real song. I then crop off that intro frame in a WAV editor. Not the most elegant solution, but it was quick.
The slow transition to the center position is just the highpass filter. The internal position of the triangle wave just sits where it was. E.g. if the triangle stops high, when it resumes the waveform will dip low and curve back to centred. This is pretty normal behaviour though.
[quote=Phytopep]Except not the first time a triangle note plays in a song. I can still see the same low frequency transition happening when I look at the waveform, but there's an abrupt click added to that.
To work around this I play a dummy triangle note in a short intro frame, and then skip into the real song. I then crop off that intro frame in a WAV editor. Not the most elegant solution, but it was quick.
[/quote]
To make loopable songs without an initial click, I've been exporting a WAV that plays the whole song more than once, then I cut off the first loop in a WAV editor. I'd just assumed that initial click wasn't a bug, so I worked around it instead of complaining :-)
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