David: You can't use XNoteSpace this way. The notes won't align vertically when justified. Add Force System Break to the last barline to see what happens. Instead use:
!NoteWorthyComposerClip(2.0,Single)
|Bar
|Note|Dur:8th,Dotted|Pos:6|Opts:Stem=Down,Beam=First,Muted
|Note|Dur:16th|Pos:4|Opts:Stem=Down,Beam,Muted
|Note|Dur:8th,Dotted|Pos:6|Opts:Stem=Down,Beam,Muted
|Note|Dur:16th|Pos:3|Opts:Stem=Down,Beam=End,Muted
|Note|Dur:8th|Pos:4|Opts:Stem=Down,StemLength=8,Beam=First,Muted
|Note|Dur:16th|Pos:5|Opts:Stem=Down,Beam,Muted
|Note|Dur:16th|Pos:3|Opts:Stem=Down,StemLength=7,Beam=End,Muted
|Note|Dur:8th,Dotted|Pos:6|Opts:Stem=Down,Beam=First,Muted
|Note|Dur:16th|Pos:4|Opts:Stem=Down,Beam=End,Muted
|Bar
!NoteWorthyComposerClip-End
as the second staff.