A lot of guys find it critical.
On a lot of android phones you will find this.
This is a especially good if you are using the caustic. Because a lot of real synths are using this to reduce the loudness. So on this ANR sound process you can make a real music. Your export must be 24 bits so the noise can not be heard. You can turn your phone in to real synthisizer. So make sure to check Noise level on your phone before you buy it. This is very important if you are mobile producer who likes to make music everywhere. And what is cool is that that you can make a lot of crazy things by compressing and limiting your songs. :)