Just tried to dock my Note 4 on my Samsung Note 2 dock and ran into an issue. The phone fits the Note 2 micro USB dock and charges and enters into the dock mode, but no sound through the dock micro USB to the dock 3.5mm speaker jack. I spent some time going through the sound and docking menu's, but no fix. I did find a work around by inserting the 3.5mm speaker cable into the top of the Note 4 headphone jack. It's a pain to have to plug in the speakers each time you dock and undock. Hope someone else figures this out!