In the Noise Player, you can select
Pink Noise or
Noise is usually recommended for training, but only in the beginning.
It is defined by: "Each octave carries an equal amount of energy."
The frequency balance is perceived as "flat" for the human hear. It can be good to use it for a while when you have never trained with this method before and need to figure out how it works.
Once you get the concept of this training, it's best to move to the music you are interested in.
It is defined by: "Each frequency carries an equal amount of energy."
To the human ear, it appears to have more energy in the high frequencies.
It is less recommended for training but it can be useful when you want to keep training with noise during more time and you have already learned how the
Pink Noise sounds exactly.