"When I first turn on the REX, the light is green but it makes an odd clicking or popping noise repetitively(this noise is relatively quiet). When I pair it with my phone(Samsung Galaxy S4, running Android 4.2.2) the light remains green, but I now have button control over the device, but no audio. When I plug in the line in, I get audio out of the speaker most of the time, but sometimes it goes into the clicking sounds, with no audio. Please advise."
Occassionally your paired device(IPhone, Galaxy, Android, ect...) needs to be turned off and on again. If that doesn't work, try a hard reset. If the problem further persists, please contact firstname.lastname@example.org.