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Just thought I should mention that I have noticed when you add vibrato to your instruments, any time you play the note of "A" in any octave, it has a bad loop point that causes clicking and popping. Only on A's though. Quite strange. It's caused me to write in key signatures that don't contain "A" at all lol.
That problem is actually a bug in the original NES sound hardware, and as you can hear it's properly emulated in the tracker.
I won't go into detail but it has to do with the square phase being resetted on certain frequencies, and A is near such a frequency.
There is a way to get around this, but almost no NSF player supported it last time I tested so I haven't added it.
Thanks for mentioning though, I will probably add it to a FAQ later.