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VHS Hi-Fi is fully capable of reproducing the full human hearing range, and then some. When you figure that the video heads spin at 1800 RPM, and the fact that the tape is in contact with roughly 75% of the head drum, that translates to some pretty heavy inches-per-second. As mentioned previously, Hi-Fi units are much more critical in terms of mechanical alignment to avoid dropouts, which can make interchangeability somewhat risky.
Another nice thing about VHS Hi-Fi is that it leaves the linear audio tracks free for other uses - time code, narration, audio cues, etc. One important point is that a video signal should be fed in also while recording, as this is your best timing reference. This will prevent any speed variations and keep the machine locked in better. Any video signal (even just black) will work fine.
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