Panning
How to get X/Y controller in Max, where X pans the sound from left to right and Y moves the sound away from you? Thanks
There are several ways to do 2D panning of audio, either using X/Y Cartesian coordinates or using azimuth angle and distance, and giving that information to a panner or an ambisonic spatializer. Here are links to (what I hope are) pretty straightforward examples of an approach to quadraphonic panning.
Example 24: Abstraction for constant-intensity stereo panning
Example 25: Abstraction for quad panning using x,y coordinates
Example 26: Quadraphonic panning with mouse control and Open GL visualization
Example 27: Quadraphonic panning based on radial angle
etc.