The grapheme “au,” which in Modern French is pronounced as the high-mid, back, rounded vowel /o/, would have been pronounced as the dipthong /aw/ at this stage in Old French.
The grapheme “oi,” which in Modern French is pronounced as the dipthong /wa/, would have been pronounced as the dipthong /oj/ in this stage of Old French.
The grapheme “ch,” which in Modern French is pronounced as the fricative, lingua-palatal, voiceless consonant /ʃ/, would have been pronounced as the affricate, lingua-alveolar, voiceless consonant /tʃ/ at this stage in Old French.
The grapheme “ou,” which in Modern French is pronounced as the high, back, rounded vowel /u/, would have been pronounced as the dipthong /ou/ at this stage in Old French.
The palatal clusters “j (+a, o, u),” “i,” and “g (+ e, i),” which is Modern French are pronounced as the fricative, lingua-palatal, voiced consonant /ʒ/, would have been pronounced as the affricate lingua-alveolar, voiced consonant /dʒ/ at this stage in Old French.
The graphemes “s,”, “c (+ i, e),” and “ç (+ a, o, u),” which in Modern French are pronounced as the fricative, lingua-alveolar, voiceless consonant /s/, would have been pronounced as the affricate, alveolar, voiced, consonant /ts/ at this stage in Old French.
The word-final, high-mid, front, unrounded vowel /e/ is not pronounced in Modern French, however it would have still been pronounced as either the high-mid, front, unrounded vowel /e/ or the later stage of the mid-central schwa /ə/ at this stage in Old French.