This patch shows how you might combine several of the abstractions that are presented in other examples. The two key abstractions here are tapoutxfade~ and quadpan~. Those are not actual Max objects; they're both patches that have been saved with those names.
For this example to work correctly, you must first download the abstraction quadpan~.maxpat which is explained in the example "Quadraphonic panning based on radial angle", and save it in the Max file search path with the name "quadpan~.maxpat".
This patch enables you to pan a sound to any azimuth angle in a quadraphonic sound system. The abstraction assumes a square configuration of four equidistant speakers: 1 = front left, 2 = front right, 3 = rear left, 4 = rear right. The sound signal comes in the left inlet, and the azimuth angle comes in the right inlet, either as a number or as a signal.
There are several standard speaker configurations for 2-dimensional surround sound panning, such as quadraphonic (four speakers in a square or rectangular placement) and the 5.1 or 7.1 THX cinema surround specifications.