Lawyer Ulrich Weber, who is leading the investigation in Regensburg, said on Friday that between 1953 and 1992, at least 231 children were beaten or sexually abused by priests and teachers of the diocese.
This number was much larger than previously thought - 72 cases of abuse had been reported by last April.
"The sexual abuse ranged from fondling to rape," said Weber.
The diocese of Regensburg announced last April that it would cooperate with victims' organisation White Ring to investigate sexual and physical abuse at the Domspatzen choir.
The diocese has already started paying compensation to the tune of €2,500 each to victims.
SEE ALSO: Church 'still dealing with history of abuse': bishop