From Music Laboratory:
Scale Changer Pro takes a MIDI file and play it with various scales and tunings. Tuning modified Midi can be saved and played with any Midi play software such as Windows Media Player. You can change scale while the midi file is played. For example, you can load a MIDI file of pops and play it with Chinese musical scale or Okinawan musical scale. You can change tuning while the midi file is played. For example, you can load a MIDI file and play it with Just intonation as well as other tunings. Can save MIDI file with changed scale and tuning. You can make your own scale and tuning data. These data can be saved as a file.