German · Pronunciation Guide
HOHKH. A long, pure 'oh' and then the throaty ach-laut.
The rhythm is the least interesting thing about this adjective — what matters is what happens when it inflects: the ch disappears entirely and is replaced by an h, giving hohe, hoher and hohen. So the base form and the inflected forms sound quite different, while the stressed long o survives unchanged through all of them.
Listen: hoch
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Der Berg ist sehr hoch.
The mountain is very high.
Listen: Der Berg ist sehr hoch.
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Der Berg ist sehr hoch keeps the adjective bare, which is the only way you hear the ch at all — any ending would replace it. Berg ends in a devoiced g, coming out 'bairk', so the sentence contains two separate things happening to written g's: one hardens to k, and one is about to vanish.
Substituting a k gives 'hoke', which is the standard first attempt. Keep the air flowing instead of stopping it. The inflection is the more surprising trap: learners produce hoche Berge, when German says hohe Berge — the ch only survives in the uninflected form, and that irregularity has to be learned rather than reasoned out.