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hi,

some probable reasons for the problem you're having:

• fluidsynth-dssi is not fully installed, especially its GUI counterpart (FluidSynth-DSSI_gtk);
• gtk2 and gtkmm2 runtime libraries are not installed, also blocking the above fluidsynth-dssi_gtk component;
• qtractor built without the support to the above gtk2 and gtkmm2 development libraries, which is prolly the cause for the Calf suite having no GUIs.

hth. cheers