Details
WARNING: VERY LOUD SOUND - however, to clearly hear the difference tones you will need to listen with the volume set quite high. Two sine waves start on A440. One remains there, while the other slowly ascends to A880, then back to A440. Both waveforms were at 100% volume, then mixed. This results in a sort of clipping that makes the combination tones far more obvious than in most demos. See a diagram of some of the difference tones you can hear: https://www.youtube.com/watch?v=sMXp_mmcH9o
