C add 9 b5 chord played through a journeys synth using bell saw massacre voice at c3 for six seconds. Converted to audio file, copied, copy reversed and two files merged with automatic crossfade. Now 16 and a half seconds long.
The data contained in this file should represent a full period sine wave. But because of the bug(s) in the header of wave file, it gets distorted (i. E. If you found the bug and fixed it in binary, you'd get perfect sine wave).