NO SOUND on iPhone 6s plus

It surprises me that such a music based game does not have sound on my iPhone 6s plus - no matter how hard I try to configure my settings. This is actually the first game ever Ive seen that has this LOW level no-sound bug on all the iPhones Ive owned! Until its fixed, 1 star and game deleted!!! Byebye!!

TGNY2012 about Give It Up! - Jump to the Beat