Re: Live Sequencing Playing Situation.
Don't worry about Meta Events... you won't need to use those for this - and I think it might end up being glitchy anyway...
In fact, if the regions are longer than 2 bars then I'd choose Touch Tracks. They can do what you want...
Create separate loopable audio regions for the main part of the track, chorus, verse etc.
Drag those into the EXS24 Instrument Editor and set the Key range so e.g. C1 note corresponds to Intro, D2 to Chorus...
Turn off "Pitch" and turn ON "1 shot"
Save the Instrument.
Create a region on the EXS24 track for each part (e.g. 3 regions, one for intro, one for chorus, one for verse etc...).
Draw the relevant MIDI note in the region to trigger the exs24. It helps to resize the region to the length of the audio sample (e.g. 16 bars...)
Mute the regions on the EXS24 Track...
Now Create a touch track object in the Environment Mixer layer and cable it to an Audio Channel Strip.
Close the Environment window and drag a region from the EXS24 track onto the key in the TT window which you want it to be triggered by.
e.g. Intro -> C1
Verse -> D1
Chorus -> E1
Set the triggers to "Single"
Set the Start to your desired choice. I find "Next Bar" works well.
Here's a pic to show an example I quickly setup:
Logic's transport must be running (playing) for Touch tracks to work. You can either use the metronome to help you trigger the parts of the track when needed or look at the Bar Ruler while Logic is playing.
Let me know if that helps :)