I can not make changes to the melody instrument or solo. Tried everything. Used F5 bar settings but it does not take account of the change of instrument. Tried saving; tried regenerating. Does not work. Please give me step by step instruction. I have prepared melody and chords and played it but when I go to a bar and use F5 it dos not make the change I asked for. Please help. I have watched the videos about this and seen all the fancy things it can do BUT nobody ever talkx about how to change the instruments at any particular point in the song. Am I doing somethig wrong ?