Add wavy brown+pink noise

[Rult]

Personally, I like the monotonous brown noise, but for sleeping it's better to listen to its wavy version. Regular crashing waves are too crispy.

If you'd like to generate it (as the other raw noises) instead of re-using the sample, you need to use SoX. After installed, it's played with this command: play -n synth brownnoise synth pinknoise mix synth 0 0 0 10 10 40 trapezium amod 0.1 30 Or recorded with this: sox -n -r 44100 output.wav synth 60 brownnoise synth 60 pinknoise mix synth 0 0 0 10 10 40 trapezium amod 0.1 30 (where 60 is length in seconds, it's better to generate initially in wav, then to mp3 via ffmpeg)

Originally the command was written on AskUbuntu.

The longer period [10 seconds] makes it harder to notice the regularity. 
The numbers mean: 
0.1 = wave crash frequency (0.1 Hz = one wave every 10 seconds); 
30% = noise level in between waves; 
1st 10% = duration (over the 10 seconds) of the rising part of the wave; 
2nd 10% = when it starts falling 
(they are both 10% so that the wave crashes as soon as it's done rising in volume); 
40% duration of the entire wave: 
this means 100% - 40% = 60% of the time is spent waiting between waves.
– Tobia

The reason I'd like to see this in Noice is because the app provides smooth turn-off when the timer goes off, which can't be achieved as easily with just SoX.

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