Conditional input

[northofscotland]

I would like to able to include some simple statements of the kind "if ...
then ... else" in the note entry.  What I would like to achieve is to have
two options for a note so that if I wanted to change the instrument where
the register doesn't match - violin to recorder for instance, I could just
change a flag or something similar at the start of the file and the
alternative notes would be substituted.  I guess that it would be possible
with scheme, but I'm still trying to get my head round that!

Any ideas gratefully received, Thanks
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