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Sorry about all the recent bug reports; I've kind of been going over FamiTracker with a lot of detail lately.
The vibrato effect, or at least 4x2 seems to be wider when exported as an NSF than it is in FamiTracker. We noticed this because of the phase reset bug/feature, i.e. 4x2 on A-3 will create clicks in the NSF but not in FamiTracker. The NSF importer seems to verify that the exported NSF vibrato is not the same (i.e. the imported NSF comes up with Pxx bends that will indeed cause clicks in FamiTracker).
I've noticed this too from the same phenomenon (duty phase resets) from some module posted earlier. The bug was caused by a mistake when doing a two-complement conversion.