[Patrick Younggreen]

[alex griffin] ” I can hear all tracks when files are played back from youtube on my computer, Ipad, but not on my iphone 5s and iphone 6 plus.”

What is the exact file extension you are trying to play on your phones? Or is it all of them?

iPhone 5S and 6 Plus and iPad Air supported audio formats:
AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV.

Dual x5650s, 24GB DDR3 ECC/Reg., HD 7950 @ 1.01GHz, SS830GB SSD, ~3.5TB HDD storage.