Is it possible to create a deep (eg. lower frequencies only) noise by the means of basic FM synthesis (like Yamahas DX system)? The usual procedure for noise is to raise the modulating operators output (and / or feedback) to a certain level where the additional harmonics blend into a chaotic broadband noise. This however claims the whole audio spectrum, beeing almost white noise. We cannot go with less modulation as this would pronounce simple harmonic parts. In fact, the sound spreads all over the spectrum before audible harmonics blur into noise.
So is there any way to do a low bandwith noise?