{"modality":"audio","payload_ref":"audio_left_tone","slot_id":"audio:left_tone","source_clock":"witness-jsonl-fixture","tick":30}
{"modality":"vision","payload_ref":"vision_corner","slot_id":"vision:corner","source_clock":"witness-jsonl-fixture","tick":30}
{"modality":"sensorimotor","payload_ref":"sensorimotor_contact","slot_id":"sensorimotor:contact","source_clock":"witness-jsonl-fixture","tick":31}