if it just feeds into playing now, which relies on the sequence order, but doesn't update said sequence order......
Playing Now is only refreshed when you do something to refresh it, typically by playing something new.
Playing Now is the
Playlist that will play. Always. When you "play" one of your stored playlists, MC (by default):
* Clears the current Playing Now list (and saves it to Recent Playing Now's)
* Fills the Playing Now list with a
snapshot of the set of files "played" (order is preserved, including files above and below the current selection)
* Begins playback with the selected track
This same logic applies to any view of files that you "play" from within MC (whether a Playlist, Smartlist, or Media View). As I said, it is a snapshot in time of what was visible on screen at the moment you "played" it. You can change the order by moving, filtering, sorting, and altering
the Playing Now List. But the original source view that "sent" the files to Playing Now no longer has any bearing on the playback order.
As I said above, this is the default behavior of MC. You can alter the behavior of Playback under
Tools > Options > General > Behavior > Double Click in a number of ways, but the core point remains that Playing Now is
the list that will play, however it gets built.
That's good though! It frees you in a number of ways. You can still alter playback order "on the fly" (and use a number of different source lists to do it) but you do not
have to change any source list to do it. You can, of course, at any time take all or a portion of the current Playing Now and
Send To > Playlist to save it as permanent list. In fact, it
automatically saves all iterations of Playing Now for you whenever you clear the list by playing something new (in the Recent Playing Now's group under Playlists). If you want to save one of these, you can just drag it out of the Recent Playing Now's folder and drop it somewhere else in Playlists.
You may find it handy to split the Media Center interface (
View > Split View > Show 2 Views). You can keep the Playing Now list open (in a narrower pane on the right, for example) and work to edit it by drag-dropping to it from the larger "full Library" view of Media Center on the left.