A Mapping layer contains an automation, which is a curve based animation. This is curve is then used as an input for a mapping. You can then use this layer that like a state mapping and add filters and outputs.
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The recorder allows you to record in time an input value and convert it into a curve. You just have to choose an Input value, activate the Arm parameter and start playing. The value of this parameter will then be shown in red in the layer and when stopping the sequence it will convert automatically into an editable curve.
Recording a perlin noise from the Generator module
Recording a perlin noise from the Generator module
You can draw a curve by holding Ctrl+Shift and dragging your mouse from left to right in the timeline of the Mapping layer. Your drawing will then be automatically converted into an editable automation.
Drawing and modifying a mapping curve
Drawing and modifying a mapping curve
You can choose the range of your automation from the "Range" parameter in the panel. You can also make it free range by disabling this parameter. You will then be able to scroll in the layer by using Alt (and Alt+Shift for zooming**)** and dragging the mouse vertically.