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I wasn’t intending to use a ‘brickwall’ filter – just to roll off more of the top/bottom to gently bandlimit the noise to the desired region. A 24dB/Oct filter (or maybe heavy shelving) would be more than enough. As for higher frequency artifacts, I don’t really know what you’re talking about there. Certainly, using a very steep filter would cause a great change in the phase response, but being pink noise – and as such not ‘timing-critical’ – I can’t imagine why this would be a problem.
I imagine a warbled (ie pitch modulated, if I read you right) tone would be useful as well, but it wouldn’t be constant at all its consituent/reproduced frequencies as it moved about. You’d have to have the modulation very fast I suppose, but yeah, I reckon that could work.
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