Hebrew
עַל חֵטְא שֶׁחָטָאנוּ לְפָנֶיךָ, בְּשִׂיחַ שִׂפְתוֹתֵינוּ*:
Chabad
al cheit shechotonu l'fonecho, b'siach sifsoyseinu*:
Chabad: ' is a reduced vowel — every vocal shva, always pronounced. - separates syllables that would otherwise run together.
How to read the transliterations