Question: what is the rate of midi clock in ppqn
[{'answer': '24 ppqn', 'provenance': [{'wikipedia_id': '11907750', 'title': 'MIDI beat clock', 'start_paragraph_id': 2, 'start_character': 97, 'end_paragraph_id': 2, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11907750', 'title': 'MIDI beat clock', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 275, 'bleu_score': 0.6540116464173451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6381465732173909650}, 'section': 'Section::::Abstract.'}]}]