Does MSAA make sense in audio / 1d data streams? In graphics, MSAA is a technique where  you take multiple samples of something per pixel and then average the values to get the final pixel value. The image quality improves as a result, and its considered a form of anti aliasing.  Does this technique have an equivalent in audio samples or other 1d data streams?
No. The reason is that MSAA works in the visual domain. Optically, we have hardwired edge detectors. MSAA eliminates unintended edges in generated images. 

Acoustically, we do not have such edge detectors, and therefore there's no reason to remove them. Also, loudspeakers already filter out such edges mechanically.