440 Hz Precise Test Tone Sine Wave Sound

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=qD5PRfYc5u4

440 Hertz sound test with exact constant frequency • The 440 Hz frequency is a reference for tuning musical instruments, and also determines the frequency of the A sound on pianos and other keyboard instruments. • 440 Hz tone is used in all modern orchestras to ensure that musical performances are consistent and compatible. When all instruments are tuned to the same frequency, they harmonise to create a unified sound. • In short - virtually all modern music we hear is music played at 440A frequency. • #440hz #testsound #testtone #testsignal #tune

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