paper sizes

[James Bailey]

I was reading the archives on how to define a custom page size, and  
I'm a little confused as to whether the issue was resolved, meaning,  
I've read the archives, and tried the suggestions there, but still  
cannot output my page size.

I've added to the file "paper.scm" the line
    ("octavo" . (cons (* 6.75 in) (* 10.5 in)))
and the music is typeset to those dimensions, but the paper is still  
a4 size.
To be clear, my input file has
 \paper { #(set-paper-size "octavo") }
#(set-default-paper-size "octavo")
I'm just wondering if there's some aspect that I'm missing.

And just to check, I ran the postscript through Preview, and got the  
same output.

Thanks tons,

James