yet another chord question

[James E . Bailey]

> I'd like to have a chord that is C-10. I have
>
> myChordDefinitions = {
>    <c e g b dis>-\markup \super {-10}
> }
>
> And then, of course the requisite
>
> myChordExceptions = #(append
>    (sequential-music-to-chord-exceptions myChordDefinitions #t)
>    ignatzekExceptions)
>
> myChordInit = {
>    \set chordNameExceptions = #myChordExceptions
> }
>
> I have my very simple input file of
>
> Chord = \chords { \myChordInit c:9+ }
>
> music = { c'2 }
>
> \score {
>    <<
>       \Chord
>       \music
>    >>
> }
>
>
> So why is the output not changed? The chord name chart shows me  
> that <c e g b dis> is a #9 chord. What I see is the default output  
> of a #9 chord.

Of course, dis' is very different from dis.