Honor 6 with lollipop - sound volume in FM app too low

morning all,

my first post here, great place to be.
I successfully installed B507 (lollipop Beta) on my Honor 6, and nave no complaints at all but...
the FM radio app, which I use a lot, has sound which is almoust inaudible. I did not have issues when i was on Kit Kat.
Tried few apps to boost sound from Play store, they all seem scam. Can someone help me please

Thanks