WebAudio/web-audio-api — pull request #440 by padenot (2014-11-18 16:45:46+00:00)
Title: Make StereoPannerNode a-rate and spec the algorithm

It was somewhat obvious, but it's clearer to also have the formulas for [-1, +1]. Also I made it a a-rate mostly because it's technically just two gain nodes with carefully computed values, and gain nodes are a-rate.

This fixes #439.