I had about given up finding the model talker information, but, I did find part of it. To speed up my synthetic voice, (with speed and pitch controls disabled) In the general parameters, down at the bottom, there is a field for "speed". Mine had a zero in it, I tried a few and found that changing it to a 2 was best. Really a 2.5 would have been better, but a 3 was too fast. However, changing it to manual mode (or whatever this is called) made all of the pre recorded phrases and individual words play back too fast. It made words that model talker created more like my voice, but any word that was my voice saying it, instead of synthesized, was messed up. I did not find a solution for this...
Oh, I flew for Continental Airlines (which is now United, but, I stopped working when it was Continental, and my "retired" ID badge says Continental even though it is no more...
I hope the MT stuff helps, wish I could do better.