Multiple tensions in Chord Mode

[Louis Guillaume]

Hi!

I'm working out a set of chord symbols to suit my needs, based primarily 
on pop-chords.ly. For the most part everything works beautifully, and 
I'm sure any issues with alignment, spacing etc. can be sorted out using 
the tools. Very nice!

There is, however, one thing that I find impossible, that is, having two 
of the same tension in the chord symbol expression. There is a single 
case I can think of and that is having both flat-nine and sharp-nine on 
a dominant chord. e.g.

  In chord mode:

    c:7.9-.9+

  In regular markup:

    <c e g bes des' dis'>

Both of these produce a chord symbol AND chord without the flat-nine. It 
seems to only accommodate one 9th, and uses the last one encountered.

Is there a way to do work around this?

Louis