The zynautoconnector is started which establishes the jack client connection to the Jack Server that does all the actual audio and midi processing, and runs this in it's own thread and handles the locking to ensure components play nice.
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The global references for the audio recorder, the mixer and the sequencer are instantiated from there modules
A dictionary called screens is defined and this has string keys that points to the individually defined screen objects that display the appropriate screens is defined.