My composition professor at MSU introduced "wigout" to me, which is a synthesis program with which on builds sounds sample by sample. You control the amplitude level and length in samples of a segment, combine a number of segments into a longer loop and dictate how the level and length variables will change over time.

This "piece" is just a sequence of a couple sounds created using wigout.

I don't remember where to get this, but you can surely find wigout online, or email me at blitonna@msu.edu and I'll try to remember, look for it, or ask Dr. Sullivan again if all else fails.