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→Flat
Another meaning is an indicator ("{{f}}") that means to lower a note by one half-step. Ex. A{{f}} is a half-step lower than A. Multiple flat symbols can be used to indicate pitches even lower. Ex. C{{f}} is the same pitch as B, while C{{f}}{{f}}{{f}} is the same pitch as A.
==== Frequency Response ====
Any signal can be broken down into an infinite number of amplitude levels for an infinite number of frequencies. Many devices will tend not to equally affect all frequencies - this affect on the signal can be called its frequency response. Speakers often have unique responses, and will often display a frequency response graph - a visual representation of how it affects frequencies input into it. All devices have their own responses, but many (most obviously amplifiers) include EQ controls to vary this.
==== Half Note ====