I may have misunderstood - do you want to enter the melody or all the parts on the sheet music? I have in the past stepentered the melody with the normal BIAB style playing the backing but even adding left and right hand piano from sheet music would be a heroic task!
As Gordon suggests you can enter notes using a midi controller. If you or you friend can do it you could 'play in' the piano part and record as midi

Last edited by Bob Calver; 01/13/25 12:11 PM.