Let's expand a bit on our sound generating toolkit, and produce 30 seconds of white noise. Go back to
Generate in the top menu, click on
Noise..., set the amplitude to 0.2 to avoid damaging your ears and click
OK. Zoom in by clicking on the magnifying-glass button and clicking on the generated waveform a few times. The result should look like this:
You will notice that it sounds pretty uncomfortable. This is because white noise has the same amplitude in all the frequency bands, but as we remember from the loudness section, we are much more sensitive to higher frequencies, and therefore white noise is not very nice when played back at high levels. It is usually better to use pink noise, a kind of noise with less high frequency content than white. In Audacity you can do this easily by going to
Generate -> Noise... and select
Pink from the
Noise type: dropdown menu.
The resulting waveform looks something like this:
... and sounds a lot more pleasant than white noise.