Scottish Child Abuse Inquiry: Boys raped by priests at 'satanic parties'
Dave Sharp also described a catalogue of sexual, physical and emotional violence at St Ninian's in Falkland, Fife, between 1971 and 1975.
Mr Sharp, from Glasgow, said the abuse had left him with "lifelong trauma".
The independent Scottish Child Abuse inquiry is looking in detail at historical abuse of children in residential care.
Mr Sharp urged inquiry chairwoman Lady Smith, to piece together the "jigsaw" of victims' accounts and called for a "national discussion" on the subject.