LinPlug Spectral - Manual (Page 22)

Noise
The Spectral's Oscillator is not capable of producing a Noise sound. We will
give some extra explanations on this, because these a frequently asked
questions:
As it would be amazing to have a noise source with such filters, why is
there no noise?
Right, it would be great. But the reason we could create such filters is, that
they are tightly integrated with the oscillators. Only together we could
create this versatile and cross-modulate-able filter. The whole engine has
been carefully designed and the option to include noise would have
increased the memory demands and the CPU usage by factor 10 at
minimum. This might not be a problem one day, but for now we stick with
not having true noise.
How can I fake a noise sound ?
Its actually pretty simple, however, its limited in its capabilities. You can
load the “Example Noise 1” preset from the “Various” bank to see and hear
it: when an Oscillator phase-modulates itself massively you end up in pretty
nice noise. Using different waveforms does slightly change the sound, but
its all somewhat similar. The big crux is that you cannot use the main filter
to shape the Noise (because of the integrated architecture we talked about
answering the first question). However, you can use the Subsequent Filter
(more on this in the Filter section of the manual on page 23). This should
be feasible for most noise requirements.
Any other options ?
There are many more, however, none of them could make the main Filter
effecting the noise spectrum for the explained reasons.
There are more “Example Noise” presets in the “Examples” bank who use
different techniques, like for example modulating the Oscillator pitch with a
noise LFO (LFO's have true noise!). Please check them out, some have a
nice noise following the pitch while some have not and hopefully you find a
suitable noise.