Since 1939 binding sound for pitching musical instruments is in 440Hz frequency. Formerly it was 432Hz.

Osciloscopes are used not only in the audio (music) industry, but also science laboratories, hospitals and clinics.

Use of spectrum analyzer provides a plot and trace of signal amplitude in the frequency domain.

Oscilloscopes are used to observe the change of electrical signal over time.

Highest note define the position of chord.

Drum sounds can't be compononents of a chord. Chords can only consist of certain notes.

Tuning fork is a tool used to pitch musical instruments.

The first of real time computer games was made for oscilloscope. "Tennis for two" was programmed by William Higinbotham in 1958....

Laryngologists use tuning forks in 432Hz becouse that's the frequency human body transcribes the best.

Key attributes of networked spectrum analyzers include the ability of synchronize data captures and effortless free acces.

There are two types of spectrum analyzers: swept-tuned and time-sequence.

In 1897 german physicist K.F.Braun engineered the first oscilloscope.

Chords contain tierces (thirds).

Chord consists of minimum three diffrent notes.

Following the discovery of fast Fourier transform, in 1962 the first spectrum analyzer was engineered.

Nowadays there are many kinds of spectrum analyzers: stationary, portable, handhled and networked.