Here is the design of a clinical trial:

Official Title: The Clinical Effects of Modified Tinnitus Relieving Sound Treatment

Included conditions:
- Tinnitus, Subjective

Study Armgroups:
- {'label': 'Unmodified music group', 'type': 'PLACEBO_COMPARATOR', 'description': '34 participants in Group 1 will listen to the music without any modification for at least two hours a day in total.', 'interventionNames': ['Other: Listening to unmodified music']}
- {'label': 'Modified tinnitus relieving sound group', 'type': 'EXPERIMENTAL', 'description': '34 participants in Group 2 will listen to the music modified according to the matched dominant tinnitus pitch for at least two hours a day in total.', 'interventionNames': ['Other: Listening to modified tinnitus relieving sound']}

Interventions:
- {'type': 'OTHER', 'name': 'Listening to unmodified music', 'description': 'Listening to unmodified music for at least 2 hours a day', 'armGroupLabels': ['Unmodified music group']}
- {'type': 'OTHER', 'name': 'Listening to modified tinnitus relieving sound', 'description': 'Listening to modified tinnitus relieving sound for at least 2 hours a day', 'armGroupLabels': ['Modified tinnitus relieving sound group']}

Primary Outcomes:
- {'measure': 'Tinnitus Handicapped Inventory (THI)', 'description': 'THI is a self-assessment inventory including 25 items with grades four categories of tinnitus severity: slight corresponding to a score 0-16, mild (18-36), moderate (38-56), severe (58-100). The higher the score the more severe the tinnitus.', 'timeFrame': '1 months from baseline'}
- {'measure': 'Tinnitus Handicapped Inventory (THI)', 'description': 'THI is a self-assessment inventory including 25 items with grades four categories of tinnitus severity: slight corresponding to a score 0-16, mild (18-36), moderate (38-56), severe (58-100). The higher the score the more severe the tinnitus.', 'timeFrame': '3 months from baseline'}
- {'measure': 'Tinnitus Handicapped Inventory (THI)', 'description': 'THI is a self-assessment inventory including 25 items with grades four categories of tinnitus severity: slight corresponding to a score 0-16, mild (18-36), moderate (38-56), severe (58-100). The higher the score the more severe the tinnitus.', 'timeFrame': '9 months from baseline'}
- {'measure': 'Tinnitus Handicapped Inventory (THI)', 'description': 'THI is a self-assessment inventory including 25 items with grades four categories of tinnitus severity: slight corresponding to a score 0-16, mild (18-36), moderate (38-56), severe (58-100). The higher the score the more severe the tinnitus.', 'timeFrame': '12 months from baseline'}
- {'measure': 'Hospital Anxiety and Distress Scale (HADS)', 'description': 'HADS includes two subscales for anxiety and depression, each with respective 7 items, and the grades are valued by scoring: negative (0-7), positive (8-21).', 'timeFrame': '1 months from baseline'}
- {'measure': 'Hospital Anxiety and Distress Scale (HADS)', 'description': 'HADS includes two subscales for anxiety and depression, each with respective 7 items, and the grades are valued by scoring: negative (0-7), positive (8-21).', 'timeFrame': '3 months from baseline'}
- {'measure': 'Hospital Anxiety and Distress Scale (HADS)', 'description': 'HADS includes two subscales for anxiety and depression, each with respective 7 items, and the grades are valued by scoring: negative (0-7), positive (8-21).', 'timeFrame': '9 months from baseline'}
- {'measure': 'Hospital Anxiety and Distress Scale (HADS)', 'description': 'HADS includes two subscales for anxiety and depression, each with respective 7 items, and the grades are valued by scoring: negative (0-7), positive (8-21).', 'timeFrame': '12 months from baseline'}
- {'measure': 'Visual Analogue Scale (VAS) for tinnitus', 'description': 'Visual Analogue Scale (VAS) for tinnitus is a universal psychometric scale evaluating subjective tinnintus. A total score is 10, from 0 to 10. The higher the score, the more severe the symptom.', 'timeFrame': '1 months from baseline'}
- {'measure': 'Visual Analogue Scale (VAS) for tinnitus', 'description': 'Visual Analogue Scale (VAS) for tinnitus is a universal psychometric scale evaluating subjective tinnintus. A total score is 10, from 0 to 10. The higher the score, the more severe the symptom.', 'timeFrame': '3 months from baseline'}
- {'measure': 'Visual Analogue Scale (VAS) for tinnitus', 'description': 'Visual Analogue Scale (VAS) for tinnitus is a universal psychometric scale evaluating subjective tinnintus. A total score is 10, from 0 to 10. The higher the score, the more severe the symptom.', 'timeFrame': '9 months from baseline'}
- {'measure': 'Visual Analogue Scale (VAS) for tinnitus', 'description': 'Visual Analogue Scale (VAS) for tinnitus is a universal psychometric scale evaluating subjective tinnintus. A total score is 10, from 0 to 10. The higher the score, the more severe the symptom.', 'timeFrame': '12 months from baseline'}

Please estimate the sample size based on the assumption: 
5% significance level, 80% power, 30% dropout rate, 1:1 grouping
Sample size calculation
        The study sample size was based on the THI scale (the primary outcome), which is used to assess the severity and treatment effect of tinnitus. Considering an 80% effective rate, 5% significance level, 80% power, 30% dropout, and 1:1 grouping, a total sample of 68 (34 per group) will be required.