Japanese · Pronunciation Guide
chi-ga-u, three beats — the ga and u are separate morae, and the u is unrounded.
chigau
The melody rises to ga and falls; the three units are all the same length. The final bare vowel is the beat most likely to vanish, since English hears "gau" as a single diphthong. Say ga and u as separate pulses and the word keeps its proper three-beat length.
Listen: 違う
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この二つは色が違います。
Kono futatsu wa iro ga chigaimasu.
These two are different colors.
Listen: この二つは色が違います。
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この二つは色が違います conjugates it to 違います, where the u of the dictionary form becomes an i — so ga-i-ma-su, and the ga-i pair still has to stay apart. 二つ (fu-ta-tsu) earlier in the sentence gives you the bilabial ふ and an affricate in three beats. Plenty of separate gestures to keep clean.
"chi-GOW" fuses the last two morae and stresses them, leaving two beats where there should be three. Keep the lips flat so no "ow" glide forms, pulse the a and u apart, and soften the opening ch — English aspirates it more heavily and makes it with the tongue tip rather than the blade.