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Speech changes to a more robotic feel if I use certain phonemes

I am using phonemes for some speaks, to make them sound more natural, but some phonemes change the rest of the sentence feel. I have made a demo here.

Using these settings:

  • English
  • EN-GB-Wavenet-F
  • speed 0.95
  • pitch 0

In the speak below I have two identical speaks, where one word is replaced with a phoneme. Notice how the end of the sentence changes to a more robotic feel in the first.

 

How do I avoid this?

<speak>
In this training, you will learn more about how you sell <phoneme alphabet="ipa" ph="kɑːd">placeholder</phoneme> as a solution for companies that want to minimize out-of-pocket spending and have better control of company spending by employees.

In this training, you will learn more about how you sell card as a solution for companies that want to minimize out-of-pocket spending and have better control of company spending by employees.
</speak>

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