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The composition in Andiamo consists in a stack of layers, with each layer drawn on top of the previous one.  The initial configuration of layers is specified in a xml file (layers.xml) stored in the data folder of the sketch. At this point (version 021 of Andiamo) there is a certain flexibility in the layer arrangement, since filter layers can be added or removed while Andiamo is running.
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After some tests I discovered one strange issue in Andiamo’s video layer: setting at every frame the volume of the video channels was creating a drop in the frame rate of around 10 fps per channel. Not sure what the reason could be for such unexpected behaviour, ultimately the setVolume method sets the volume property in the underlying gstreamer’s playback pipeline. The solution for this problem was simple: to avoid setting the volume at every frame, but only when there are changes in the mixing of the two channels.

This fix, which increases frame rates very substantially, plus the inclusion of version 3 of the traer.physics library were included in a new release of Andiamo, 021. The complete skecth folder and the required libraries are available for download here.