This game is horrible, please just save your money and buy a better game such as rocksmith, a game that actually has accurate, good music and a simpler system to understand. As well premium is super expensive. Its not worth the money. I tried this for about two weeks and not only did the tuner constantly drop out on me, but I had my amp on at a fair volume and a clean tone, and the notes werent getting picked up.
I then tried a game like rocksmith (got it for sale on steam) and it was way better. But please just save your money and dont buy this game. Because you could learn more from guitar hero than this.