From Katsura Shareware:
AudioTest generates audio test signals and can save audio test signals as AIFF files. Wave types: sine wave, triangle wave, sawtooth wave, square wave, pulse wave, anti-aliased sawtooth wave, anti-aliased square wave, anti-aliased pulse wave, uniform distribution white noise, pink noise, brown noise, and Gaussian distribution white noise. Frequency: fixed, linear sweep, and logarithmic sweep. Level: fixed, linear sweep, and logarithmic sweep. Phase shift: +/-180 degrees. Sample rates: 11.025k, 22.05k, 32k, 44.1k, 48k, 88.2k, 96k, 176.4k, and 192k.Bit depths: 8-bit, 16-bit, 24-bit integers, and 32-bit float. Channels: mono, stereo, left, and right. Level meters: peak, RMS (root-mean-square), and average. Save audio test signal as AIFF file. Scroll wheel support with text fields and sliders. Keyboard shortcuts to adjust various parameters. Undo/Redo support for parameter changes. AppleScript scripting. You can create your own audio test CD by saving AIFF files and burning a CD-R/CD-RW with iTunes.