Two keyed compositions — Front and Top (like baccarat). Each is created and tuned inside the real chroma setup tuner (opened below), so the stream creation is byte-identical to the tuner and the Bintu keyer triggers correctly. The tuner hands its output back here for the switch.
Every keyed output of each composition becomes its own lane (paired Front↔Top by creation order). One cue calls NanoPlayer switchStream() (switch.method:'server') on all lanes at once — every output cuts in sync.