Quan Yin practitioners will surely transform if they really follow Master's instructions in their spiritual practice. It is impossible that they remain the same, because the power of Quan Yin is incredible and it will help us cleanse all our karma. Only at that time can we truly understand that karma does not exist in the first place. At that time, we will forgive ourselves and truly realize that we have no sin.
The sound stream can comfort our minds. If the mind can be calmed down, the soul will be able to make good use of it, and then it will truly think on its own and realize that "karma does not exist originally". The mind will see the world as truly just a stage, with nothing happening really at all. Only then can we say, "karma does not exist originally", which is the real ultimate liberation.