Thanks for the prompt feedback guys... Now...
Let me give you a couple of scenarios...
A- Let's say I open a new project, and make one software-instrument track, then add a multi-output UB to that one track, I know I can use the plus sign in the Logic mixer to add aux channels for each voice, and that's always worked great, but when I tested out adding tracks thru the mixer using options>create arrange tracks for selected channel strips, this doesn't do what I want. Or, I'm not doing it right.
With the one multi-output UB instrument, I'll open five aux's, but then whatever region I have on the arrange page, does not trigger any sound out of UB. I've made sure that UB voices are assigned for a particular aux channel strip in the Logic mixer, which now have their own arrange page tracks, but still, no sound.
B - Now, on the other hand, when I start up a new Logic project, and open a multi-timbral software instrument set of tracks (16 for example), I seem to be able do what I want. I load a multi-output UB into the multi-timbral channel strip, and using the Logic mixer, I open up my aux channels, which are assigned to play individual voices in UB.
I now have 16 tracks on the arrange page, and I'll load single voice sequences from UB into seperate tracks. In the Logic mixer, I will only have one channel strip channel for UB, but can of course, add aux channels for the individual voices. Once everything is split right (voices going into particular aux channels, similar to my A scenario) all seems groovy.
But of course, according to the manual, this doesn't seem like it should be possible. Unless I'm just not understanding the manual, or it's not accurate.
Either way, I think I now have what I wanted, so what difference does it really make on how I get there? Well, I hope this way would not screw up things later on... Not sure...