JHB thx for the reply. The note and other galaxy tabs do indeed put the stock music player controls in the notification panel. But that is a convenience interface feature since, unlike the phones (including the S4) the controls don't show up on the lock screen (and you can "pull up" the notification panel from the lock screen). In fact, before I got the Note 10.1 I used the notification panel on my Tab 7 Plus as a sort of poor man's multi-window (using the proper term now, instead of "multi-view") for the music player while I had google maps on the full screen. Not sure why having the controls on the notification panel would preclude the the app from being multi-window compatible on the S4 since the controls would show up on the player's app window as well. What am I missing about having the controls on the notification panel as a reason to preclude having the app appear in multi-window mode in touchwiz? There are a lot of non-obvious touchwiz features (and quirks/bugs) that I am still learning 2 years after getting my first Samsung galaxy device (the original galaxy tab).
Speaking of still learning: I also figured out from a thread in the Note 2 forum (
http://forums.androidcentral.com/sa...9-multi-window-compatible-3rd-party-apps.html) why my multi-window tab kept disappearing (despite having multi-window enabled in settings). For those who are as in the dark as I am regarding the arcanities of touch wiz, holding the back button toggles the multi-window tray in three states (tray tab present, tray tab absent, and extend tray). This is only works (of course) if you have multi-window enabled in settings. Check out the linked thread for some good info on multi-window implementation in touchwiz including a listing of touchwiz-multi-window-compatible third party apps.
Of course if you root (which enables multi-window for just about any app using the root enabled multi-window app launcher) and/or don't have any reason to use the stock music player (I am sure I am in the minority on this one), these issues are all moot - but thanks for reading anyway.