Fixing the Number of Input and Output Signals

In the examples above, the input signals were usually defined implicitly by the defining FAUST expression:

  foo = faust_expression; // inputs and outputs determined by expression

Sometimes, however, it is helpful to fix the number of input signals. For example, to define a stereo processor, one can begin and end its definition with two wires:

  foo = _,_ : faust_expression : _,_;

Such practice also helps to more easily catch errors when the number of input or output signals comes out wrong in the defining expression.