You can use system preferences startup disk to choose which partition to boot from. That's the only way to make the boot device stick, holding down option at startup works for temporarily booting off any device capable of booting.
If you just installed 10.11 then you likely have all the current updates installed. They're installed in exactly the same way as under 10.9 - app store, updates.
Thanks for the thoughts; I do know about "start-up disk" . . . I got out of the habit with it because it has been suggested that using it interferes with rEFInd or the other boot managers . . . which so far I haven't installed. I'm still fiddling with the two OSX's . . . when I'm in 10.9 it shows 10.9 in startup, but rebooting seems to auto-fill 10.11.
Got it on the App store . . . I believe that before I did the SU, that App store was showing it in the 10.11 side, but when I did it in 10.9 that option went away in 10.11 . . . and it does show in 10.9 App that SU was "installed in 10.9.5" . . . anyway, it's probably "done."
On the news of fresh disaster front . . . now back in 10.11 there are "alert" sounds, but trying to watch a YT video, no soundtrack. I went into SP and clicked "Sound" and tried to find something, added "sound" to toolbar, but it is greyed out, showing as "max" . . . I left the default setting . . . I don't have any ext speakers . . . . I tried to get the system voice set, but whichever I chose . . . no voice???? Perhaps it's because I'm in total "resistance" to the graphics of 11 that just make the whole experience visually . . . lacking . . . ????
I'll have to drop back over to 10.9, but I think there I have had various sounds . . . although I didn't get "zardoz" set up yet . . . Zardoz says it best . . . . : - ))))