From the
Wiki article on aatxes:
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Aatxe is a Basque ghost in the shape of a red bull, but sometimes in the shape of a man. At night, more so in stormy weather, he arises from the hollow which is his lair. He attacks criminals and other mean people.
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So, naturally one would look up what is a Basque. That leads to
this central page on Basque, which includes an article on
Basque language. Two important parts:
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Basque also features postalveolar sibilants (/ʃ/, written x, and /tʃ/, written tx), sounding like English sh and ch.
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So the tx is the equivalent of a ch.
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The vowel system is the same as Spanish for most speakers. It consists of five pure vowels, /i e a o u/.
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The vowels are pronounced the same as Spanish vowels.
Also, while using Google I found
AhoTTS for generating mp3s of Basque pronunciations, which confirms what I looked up.
The correct pronunciation is "aa-che."