Question about channels and merger on destination

Does anyone know why i get stereo sound out of this example?

http://jsfiddle.net/bJqkm/

I have a merger with two inputs, connected to the destination, and i assume
that whatever goes into merger in#0 goes to left, and in#1 goes to right,
yet the oscillator i connect to an input of the merger sounds in stereo. Am
i overlooking something?


Peter