I think I've finally found a decent solution to comping slashes. Insert headless notes with stem length zero and then use the lyric editor.
Your lyric is simply a number of / marks. You might want to change the page setup/fonts so that lyrics are in a good, solid font to do this, but I just used Times New Roman 14 Bold Italic.
The lyric should have a vertical offset sufficient to place the / in the middle of the staff.
The staff in this example, vertical upper size 18, lower 10.
The music notation:
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|Key|Signature:C
|TimeSig|Signature:Common
|Note|Dur:4th|Pos:0z|Opts:Stem=Down,StemLength=0,Muted
|Note|Dur:4th|Pos:0z|Opts:Stem=Down,StemLength=0,Muted
|Note|Dur:4th|Pos:0z|Opts:Stem=Down,StemLength=0,Muted
|Note|Dur:4th|Pos:0z|Opts:Stem=Down,StemLength=0,Muted
|Bar
!NoteWorthyComposerClip-End
The lyric:
/ / / /
One lyric line Alignment Top, vertical offset 14
To enter chord symbols, use a layered staff, with the names of the chords as lyrics, anchored to headless, stemless & muted notes.
The two staffs should work well together (except the designated Staff Lyric font might not look good as a chord symbol)
What are: comping slashes?
The practice of supplying background music comprised of chords while a soloist is improvising, most often accomplished by the keyboard or guitar player
(According to a dictionary)
"Comp" is short for "accompany." The best way to explain comping slashes is to send you here:
http://en.wikipedia.org/wiki/Slash_notation (http://en.wikipedia.org/wiki/Slash_notation)
and for more info, go here too: http://en.wikipedia.org/wiki/Comping (http://en.wikipedia.org/wiki/Comping)
A concise explanation is found on the Dolmetsch site too http://www.dolmetsch.com/defss3.htm (http://www.dolmetsch.com/defss3.htm)
.