HMM automatic vowel detection

[MarcoP]

the colored matrix does seem wrong, or strange.
Why is the left block not associated with a letter, see also your first posting image, is that the space?

Yes, the first block corresponds to the space character. I labeled it with an underscore in the histogram for English.
For both Latin and English, space is mainly associated with the "vowel" state, because words tend to end with a consonant (and the two states alternate).

The Italian matrix is quite similar, but space is associated with the "consonant" state, because words tend to end with a vowel.