         let nfOctaveReducedSorted = nfOctaveReduce.sorted {$0 < $1}
         numberField = nfOctaveReducedSorted
 
-        // uniquify.
+        // optional uniquify.
         // provide epsilon for frequency equality comparison
 
         // update

            return nil
        }
        
        return noteArray
    }
}

        return trimmedString
    }
    
    
    
    open func numberField(fromScalaString rawStr: String?) -> [Element]? {
        guard let inputStr = rawStr else {return nil}
        
        // default return value is [1.0]
