Well after much sorting through the forums, I decided to install Poweramp on my N4 and N7. I did the free trial thing and then decided to purchase. I am in China, and the site offered a discount for China buyers, however, when I went through the procedure and got to checkout, it showed the original price in $US. After many emails to Poweramp to see what was going on, I finally gave up and paid the full price. I sent an email shortly sfterwards to find out when I would receive the unlocker code. Since then 2 weeks ago, there have been many emails back and forwards, with them saying they have no proof of purchase and me sending the Alipay receipt over and over, along with forwardng the email from PayPro with the order number, and saying that I had chosen Alipay to purchase on the website. Poweramp still continue to deny that I have purchased. Last correspondence from me read; Alex. I have deleted Poweramp, I have had enough of this bullshit, Buy yourself a beer with the $3.99. Beware of the incompetence of this company!!!