please help tab s 8.4 and ppsspp

hi hope someone can help..i bought a tab s 8.4 and was really happy with it and I like the 16.10 ratio....I like playing emulators like ppsspp and so on..i had a problem with the device and sent it back and got a refund..recently I have got another one and when I play darius burst on ppsspp I get a really bad crackling of the sound...the last one I had im sure I never got it..could someone with either the 10.5 or 8.4 test this for me I would be really grateful ..I understand all about the speed wont be full ..I tried the same setup on the ipad air 2 and no sound crackling...its when you go to player select I can hear it in the right hand corner .....I also tried it with my shield portable and its near perfect...is it a case the exynos isn't enough ..I was tempted to wait for the new s2 but im not to keen on the 4.3 ratio