 
 <prompt> Wetin be jnd? Based on di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```Di just-noticeable difference (jnd) (di threshold wey change fit dey noticed) dey depend on di frequency content of di tone. Below 500 Hz, di jnd na about 3 Hz for sine waves, and 1 Hz for complex tones; above 1000 Hz, di jnd for sine waves na about 0.6% (about 10 cents). Di jnd dey typically tested by playing two tones quickly one after di other and then ask di listener if dem notice any difference for dia pitches. Di jnd go reduce if di two tones dey played at di same time as di listener fit hear di beat frequencies. Di total number of pitch steps wey fit dey noticed for human hearing range na about 1,400; di total number of notes for di equal-tempered scale, from 16 to 16,000 Hz, na 120.``` 