Organ Accompaniment
While the organ may provide accompaniment for the congregation, which can prove useful for participation,it is 'forbidden' to accompany the Celebrant on the organ at the Orations, Preface, Pater noster, etc.
Asperges Me
Vidi Aquam
Responses at High Mass - Solemn Tone
Responses at High Mass - Ferial Tone
Download the entire "Parochial Hymnal", which includes organ accompaniments to the Credo, Chant Ordinary, Hymns for the Benediction, and beautiful old Hymns.