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  • $\begingroup$ @Kuba But the symbol a is used within Plot, why shouldn't it be possible to use it within Setter? $\endgroup$ Commented Jun 25, 2015 at 8:21
  • $\begingroup$ An explicit a is also used for the Manipulator, why not for the Setter. $\endgroup$ Commented Jun 25, 2015 at 9:10
  • $\begingroup$ This is how I see this question, you have "a=90" as an input, update variable a which is local to Manipulate. Next input is "b=25" your setter still updates a. $\endgroup$ Commented Jun 25, 2015 at 10:10