If possible , use the Tracker keyboard as Text To Speak , to create Robotic or necessarily inhuman voices , with filter templates to assign to the generated voice .
I don’t think that is possible at the moment…
BUT! You should have a look at Vital (see: https://vital.audio/)
You can use Text to Speech in it and save samples that you could import to the tracker. 
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No VST Please…only Polyend Tracker. Thanks for your answer!!!
Then there is no easy way to achieve what you are looking for.
A staple for voice synthesis is usually the formant filter, which doesn’t exist on the tracker.
Another option would be to use a microphone to record your voice to the tracker and work with those samples.
Have a look at this example:
If a formant filter is a feature you would like to see in the future, feel free to create a Feature Request in Draft wishes - Polyend Backstage 
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Thanks for tips…just like this… 