Phill and Stubbsonic!!
Now that I finally had time to revisit this whole situation, I'm pleased to announce that I found the PERFECT solution!!!
It was so easy I can't believe I didn't figure it out from the beginning.
BTW, I did try your tip in Finale, Phil, but it didn't work as expected (I hadn't seen your last post yet, so I will try it now, just to see. I think that's what messed me with Finale up, as you predicted

)
Stubbs, I also tried your suggestion. While it's workable, it's not something you want to keep doing (and I have a lot of chunks because I'm using Song Mode too).
SO, as it turns out, it's MUCH easier for me to do all these messing-around with tempo and time signature things in DP!
At this point, I'm orders of magnitude more agile and knowledgeable in DP than in Finale, so I just reopened the app that I know, and just figured it out...
Like this>
--- Change the time signatures normally, i.e., from 6/4 to 12/8, with a dotted quarter note as the Metronome Click beat value.
--- Then, to avoid losing the sync between tempo map and time-scaled notes, simply select both, the MIDI piano track AND the Conductor track.
--- THEN, apply the Scale Time command to increase by 150%, and watch how the tempo map and the performance "grow" together! (before I was only selecting the MIDI track alone; no wonder it didn't work).
--- Now, at this point, the tempo will be 50% slower (because of the Scale Time command). To compensate, simply invoke the Scale Tempo command and increase the full tempo map by 150%.
Voilá!!!!!
The performance now sounds EXACTLY like before, but now with correct notation
and display in the MIDI Editor
and correct click.
I even tried playing the new scaled MIDI performance against the previously recorded audio track (before I changed anything), and they play together to
phasing perfection!
I really love DP. Especially when you can do with it basically anything you want and being able to go back to composing mode in just moments.
