initial commit, 4.5 stable

doc/classes/AudioEffectEQ21.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="AudioEffectEQ21" inherits="AudioEffectEQ" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+	<brief_description>
+		Adds a 21-band equalizer audio effect to an Audio bus. Gives you control over frequencies from 22 Hz to 22000 Hz.
+		Each frequency can be modulated between -60/+24 dB.
+	</brief_description>
+	<description>
+		Frequency bands:
+		Band 1: 22 Hz
+		Band 2: 32 Hz
+		Band 3: 44 Hz
+		Band 4: 63 Hz
+		Band 5: 90 Hz
+		Band 6: 125 Hz
+		Band 7: 175 Hz
+		Band 8: 250 Hz
+		Band 9: 350 Hz
+		Band 10: 500 Hz
+		Band 11: 700 Hz
+		Band 12: 1000 Hz
+		Band 13: 1400 Hz
+		Band 14: 2000 Hz
+		Band 15: 2800 Hz
+		Band 16: 4000 Hz
+		Band 17: 5600 Hz
+		Band 18: 8000 Hz
+		Band 19: 11000 Hz
+		Band 20: 16000 Hz
+		Band 21: 22000 Hz
+		See also [AudioEffectEQ], [AudioEffectEQ6], [AudioEffectEQ10].
+	</description>
+	<tutorials>
+		<link title="Audio buses">$DOCS_URL/tutorials/audio/audio_buses.html</link>
+	</tutorials>
+</class>