The excellent Sox sound file format conversion program includes a text file list of numbers between -1 and 1 as one of its formats, so I wrote some perl scripts to generate some of these files and then converted them to .au files for your web listening pleasure. Random numbers don't work, but once I figured out that perl's sin() function would give me the equivalent of a sine wave, the rest was just modifying that sine wave over the duration of the sound clip.
All sound files are about 16 K.
(2023-05-26: replaced .au files with .mp3 versions.)