Its exact concomitants in Classical Latin are uncertain .
In A-L , it is marked by greater tension , higher pitch , lengthening of vowel , and ( in certain cases ) changes in vowel quality .
A-L 's exact concomitants in Classical Latin are uncertain .
In A-L , it is marked by greater tension , higher pitch , lengthening of vowel , and ( in certain cases ) changes in vowel quality .