Vir2 Instruments has created a collection of 156 unique MIDI files of highly-usable strumming patterns. Offering 3/4, 6/8, and 4/4 count patterns, these MIDI files are an excellent tool for discovering a starting point for compositions. 

Details 
• 156 total MIDI files
• 125 - 4/4 count
• 18 - 4/4 swing
• 6 - 3/4 count
• 3 - 6/8count
• 4 - 3/4 swing 

Click here to view a video tutorial of the MIDI Strumming Files.

Download here