Piano scoring with centered dynamics

[Westley Martínez]

Hello, I'm new to LilyPond and am using it to engrave my own piano pieces. I 
notice that by default dynamics are aligned with notes. I'd like the dynamics 
to be centered between staves. I found a template here:
http://www.lilypond.org/doc/v2.12/Documentation/user/lilypond-learning/Piano-
templates

but when I generate the PDF, only the pedal parts show up. The dynamics do 
not appear. Maybe the template just needs to be updated. Anyway, if someone 
could point me in the right direction, that would be great.

Thanks,
Westley Martínez