Robotized voice with the tts_tangle_arctic recipe

[DiegoJota]

Hello I'm starting some tests with Idlak but I found some problems.
Performing the copilation according to the documentation and using the recipe ts_tangle_arctic, I didn't get such a good result in a synthesis. The voice is robotic and strange to hear, see the waves below.

Before using the Arctic recipe, should I make any adjustments to get a better result?

My environment
OS: Ubuntu 18.04
GPU: GTX 1660 6GB
RAM: 40GB

The audio
https://drive.google.com/file/d/1mCftYk8aJ1LiroUZ0ZkUFGiabin3HLZX/view?usp=sharing