Passing a variable into a scheme function? (need syntax of)

[Rick Hansen (aka RickH)]

How can I pass a variable into the "magstep" function?

The following fails on a parser error, the log ends with "parsing...".  I
would like to be able to pass a scaling factor into my template along with
all the notes variables.  When I hard-code -3 into the template it works
fine, but when I try to use the variable called "varMyScaleFactor" it fails. 
I'm not a scheme programmer, so this should be a simple syntax question (I
hope).


% Song file follows...
\include "english.ly"

varMyScaleFactor = #-3
varMyNotes = \relative c {
c4 c c c |
c4 c c c |
c4 c c c |
c4 c c c |
}
varMyTitle = "My Fish Freddy"



% Template file follows...

#(set-global-staff-size 20)

\header {
        title = \varMyTitle
}

<<
     \new Staff
     \with
     {
         fontSize = \varMyScaleFactor
         \override StaffSymbol #'staff-space = #(magstep \varMyScaleFactor)
     }
     {
         \clef treble
         \varMyNotes
     }
 >>


Thanks
Rick



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