![]() ![]() Each note is 1 number larger than the previous, and the ratio of frequency is always 12 √ 2 (approximately 1.06), with A 4 being 440 Hz. There are 131 notes on Scratch's keyboard, numbered from 0 (C -1, about 8.18 Hz) to 130 (B♠9, about 14917.24 Hz). To change octaves, simply add or subtract 12, or click on the arrows at the top of the keyboard. Even though the drop-down keyboard on each block shows only one octave of notes, a number can be put in manually to get any note. A line going from a long red box means the notes go to the same key on the piano. The most common enharmonic notes are included. All notes can be written in an infinite number of ways. Notes written in the two most common clefs (treble clef and bass clef) are connected to the piano. ![]()
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