a First you will check your own just-noticeable-difference, which is the smallest change in frequency you can detect. Leave the generator at the defaults and push play. Then gradually increase the frequency 1 Hz at a time, until you can tell that the pitch of the sound has changed. It may be more effective if you type in a new value (441, 442, etc) one at a time and reset to 440 in between. Report this value, and share your results with your group. a Now you will check your limit of frequency discrimination, which is the smallest difference in a pair of tones that you can discern to be distinct. Again leave the first generator at the default and push play. Now switch over to the second generator, push play, and begin to increase the frequency using the arrow, 1 Hz at a time. The pair of tones should start to wobble, creating what is called "beats"