force distance between bars for chord only staff

[freddy]

Hi,

I'm trying use 2.6.x to produce jazz staff without the 
melody staff. My problem is I would like to get 4 measure 
per line with the same distance between bars. It looks 
lilypond affects different distances on each measure 
depending on the number of chords per measure, and finaly 
the staff is not easy to read.

I've read a bit the documentation about the SpannerSpacing 
interface. But because I'm a newbie with lilypond I'm not 
able to use it properly, that's the reason why I ask 
lilypond users to give me some help !

Additionnaly, if you know about websites on which I could 
find lilypond templates for jazz staff, I've tryed to 
found this with google, but I didn't success with this 
too...

Thanks,
Freddy.