They rigged a speaker to play tones resonant with each individual bowl and then watched how the water responded at different amplitudes.
Simply, you play tones that surround the root of the next chord as you approach it.
While Cornelius played "Tone Twilight Zone," a dreamy instrumental track embellished with nature sounds, the audience watched a pair of fingers walking (and briefly figure-skating) across a room full of knickknacks.
(These include the gorgeous, bewildering "Segaiha," by the Japanese Royal Palace Band: as far as I can tell, it's a few string instruments, bowed and plucked, maybe a reed organ playing tone clusters).
Subsequently the experimenter played tone pairs and the children had again to determine if they were the same or not.
Ms. Lukas played tones that bent, swirled and fluttered, accompanied by plucked glissandos on cello and icy piano figures.
Doctors learned this by playing tones to patients and asking them when the volume of the real sound matched that of the tinnitus, Dr. Martin said.
Finally, you can check some of your work with a test record, like the Cardas Frequency Sweep and Burn-In Record ($15 to $30), which plays tones that help confirm that the setup is correct.
As we watched, a man on a rooftop transmitted some coördinates to the computer below, which directed the dog to the target by playing tones for "Left," "Right," and "Stop" over the headset.
Sleepow - a pillow that plays tones at slightly different frequencies for each ear, which its maker claims promotes relaxation.
