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If it were a problem with the dependencies installed on the system, Calf and Carla would not work either in Qtractor installed via .deb, or compiled.

This is not the case. Calf and Carla work without problems with Qtractor installed on my computer. The error only appears in the Qtractor AppImage.

Hence the explanation I have found, which of course may be wrong: The AppImage prevents access to the system resources by replacing them with its own.

However, what you are explaining does not explain what happens either:
A computer with all the dependencies of Carla and Calf installed and working correctly in Qtractor installed, does not work with the Qtractor AppImage.

Something is happening