Chord troubles

[David Strandberg]

I'm having some trouble with chords.  I'm using the
jazz style override as shown below:


\context ChordNames = jazz {
  \property ChordNames.ChordName
  \override #'style =   #'jazz
  \changes 
}

But I can't get an altered Bb chord to print.  When
you see a "Bb alt." it's usually a Bb7 +5 +9, and
sometimes just Bb7+9 for short.  Using "bf:7.9+" to
define this, I get a Bb maj7 +9, which is wrong. 
Using "bf:7-.9+" is even more strange:  I get
something that looks almost right, except there's a
flat sign instead of the 7.  Also, the chord's
accidentals and numbers are too low.  Is this a
problem for anyone else?  I'm using Lilypond 1.4.11.

I put up a tiny web page with examples; the original
source (The Real Book), lilypond output, and the
lilypond source.  It's at
http://personalpages.tds.net/~dstrand/lily.html

Lilypond is great stuff, but I'd love to see the
accidentals and numerals moved up to the superscript
position.  I believe the Bb7+9 thing is a serious bug.
 Also, it would be great to actually have a bf:7\alt
chord type, but I could get by with "Bb7+9".

Anyone else having these problems?  

Thanks, 

Dave

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