/usr/share/kdenlive/effects/aecho.xml is in kdenlive-data 4:17.12.3-0ubuntu1.
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="avfilter.aecho" type="audio">
<name>Echo (avfilter)</name>
<description>Add Echo</description>
<author>libavfilter</author>
<parameter type="constant" name="av.in_gain" max="1" min="0" default="0.6" decimals="3">
<name>Input Gain</name>
</parameter>
<parameter type="constant" name="av.out_gain" max="1" min="0" default="0.3" decimals="3">
<name>Output Gain</name>
</parameter>
<parameter type="constant" name="av.delays" max="90000" min="0" default="1000">
<name>Delay</name>
</parameter>
<parameter type="constant" name="av.decays" max="1" min="0" default="0.5" decimals="2">
<name>Decay</name>
</parameter>
</effect>
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