I use the AudioManager.setStreamMute(..,true/false) function to make mute or unmute to the Audio channel. Obviously cut the sound of blow, I would like the cut was not so abrupt, but before silencing is going down the volume sound fadeOut and to remove the silence as it goes up as was sound FadeIn .
It occurs to me that instead of setStreamMute() (which is deprecated from API 23) you could use setStreamVolume (int streamType,int index,int flags) within a for with a small Timer so that it is not so instantaneous. Here the docu
Sorry I did not put an example code, but I do not have an android editor here