/usr/share/kdenlive/effects/sox_echo.xml is in kdenlive-data 16.12.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | <!DOCTYPE kpartgui>
<effect tag="sox" id="sox_echo" type="audio">
<name>Sox Echo</name>
<description>Sox echo audio effect</description>
<author>http://sox.sourceforge.net</author>
<parameter type="constant" name="gain-in" max="100" min="0" default="50" factor="100">
<name>Gain In</name>
</parameter>
<parameter type="constant" name="gain-out" max="100" min="0" default="100" factor="100">
<name>Gain Out</name>
</parameter>
<parameter type="constant" name="delay" max="500" min="100" default="150">
<name>Delay</name>
</parameter>
<parameter type="constant" name="decay" max="100" min="0" default="80" factor="100">
<name>Decay</name>
</parameter>
</effect>
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