Pattern 4 - Rock Straight 8 - Hi Hats All Closed - File Name 'rockstraight8th4.mid'
Pattern 4a - Rock Straight 8 - 2nd bar - Last Hi Hat Open - 'rockstraight8th4a.mid'
Pattern 4b Rock Straight 8 - each bar - Last Hi Hat Open - 'rockstraight8th4b.mid'
Pattern 4c Rock Straight 8 - 2nd bar - '3+, 4+' Hi Hat Open
Pattern 4d Rock Straight 8 - Both bars - '3+, 4+' Hi Hat Open - 'rockstraight8th4d.mid'