unfortunately i wanted to avoid any externals for this patch (i mean any extra externals not present in the pd bundle). i guess i'm going to have to remplace my expr with simple operators ... jeez ... i'm going to love this .. :)
i think this $0 support would be a nice thing to add in the expr todo list :)
the problem is a more general one ... if you have a symbol $0-bla, expr has no knowledge, if it's a symbol "$0-bla" or the term "$0 - bla" ...
probably there will have to be some macro to access values ...
cheers... tim