Not only should the level meters and peak indicator update when you scrub audio (so many apps don't even do that!), I think peaking should be indicated in the waveform preview itself: if a pixel column in the preview waveform includes a sample which hits 0dB, that whole column should be colored red.
While I'm at it, there should probably also be a similar (but more subdued) indication of sample ranges which are over some (settable) nominal level. If you're authoring for DVD, for instance, you generally want to keep your levels below -20dB.Hmm. I guess in addition to a level meter, we should also have a master audio track where we can do master audio automation and get a waveform preview of the mix.
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