>Maybe a starting point would be to look at actual samples, and try to >deconstruct them with sonogram producing software. > >I suspect that using low frequency 1/F noise to sweep a filter would be part >of it. Modulating a VCO with noise is another trick. IIRC that's how Suzanne Ciani did the famous 7up fizz. -- Terry Bowman, KA4HJH "The Mac Doctor"