How do you get applescript to say multiple things simultaneously?

Question

I'm quite new to applescrips, and although I've written some basic scripts, I can't really do anything useful (since I have no knowledge of how to use Terminal commans or how to run shell scripts).
I've been trying to get applescript to say multiple things at once, in the same OR in different voices, whatever. No matter what I've tried, it either waits for what it's currently saying to finish before saying a new line, or it cuts off all lines but the last one before speaking.
I've tried say all by itself, with stopping current speech, without waiting until completion, or with both of those last 2 at once, like shown here:
say "TESTING" using "Agnes" with stopping current speech without waiting until completion
say "TESTING" using "Alex" with stopping current speech without waiting until completion
(Take off whatever endings you want, I don't even like those there.)
None of them worked. Also, putting a delay in between doesn't work either.
I've also tried saving applescripts that say something as their own scripts and opening those with a different one, like so:
run script file "Macintosh HD:Users:MY NAME:Library:Scripts:TESTING1.scpt"
run script file "Macintosh HD:Users:MY NAME:Library:Scripts:TESTING2.scpt"
But that didn't work either.
I'm stuck and neither Google nor any Apple support threads I could find could help me.
Any help would be much appreciated, thanks.

Answer 1

You can try a script I have, and work from that:
set anSwer to the text returned of (display dialog "What text do you want to say?" default answer "") as text
set the_names to {"Fred", "Bruce", "Alex", "Albert", "Ralph", "Junior", "Vicky", "Agnes", "Kathy", "Princess", "Victoria"}
repeat with this_name in the_names
          tell application "System Events"
                    try
                              say "Using" & this_name & "'s  voice..., " & anSwer using this_name
                    on error
  display dialog "Didn't Work" giving up after 3
                    end try
          end tell
end repeat