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Sometimes when people talk about VA's being too "bright" I wonder if they ever tried adding a touch of EQ to roll off some of the high end? Maybe they really mean "harsh" and not "bright". I can see where that would be a problem.
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Well, I am currently doing a research paper for a university, and among other things I came across is this *brightness*. Most acoustic instruments and lots of analog synthesizers have spectra that tapper off with increasing frequency. It seems that the *problematic* range is somewhere from 2KHz and up. I am over-simplifying things here, because trust me, we don't want to mess with the maths. You can of course place a lowpass filter at 2Khz and adjust it to taste, but that has two detriments: first it colours the sound of the passband and second the curvature from 2 KHz and up is again different. Probably you could use a convolution filter running at 96KHz, but this is very computationally intensive. This is why so many digital oscillators tend to sound *nervous* or *harsh* or *bright* and this emulation has to be done in the algorithm that gets executed by the DSP.