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DEPRECATED - use ^value(sum())^. See ^value^, sum().
^sum( group , attribute[, precision] )^
Returns the sum of the attribute values for all the notes within the group.
An optional third argument precision lets you set the number of decimal points that are exported by the numeric group markup elements(^sum^, ^min^, ^max^, ^mean^, ^count^). Note that precision is always the third argument.
Internally, the sum() operator may be used.