• Using Windows Media Player
• the tempo can be adjusted incrementally [Menu:  View | Enhancements | Play Speed Settings]²  and
• right/left stereo (speaker) adjustments (not available on all systems?) can enhance or minimize Tenor-Bass (right) & Soprano-Alto (left) parts.
• Note:  The "voices" are not intended to blend and be "pretty" -- but to be more easily discernible.
  
• Even though the current revision is not perfect, it has helped me with the timing (& notes).
  

      WMP Clip Fast Normal..> 24-Feb-2011 11:05   33K  
      WMP Clip Menu Enhanc..> 24-Feb-2011 11:05   41K  
      WMP Clip Play Speed ..> 24-Feb-2011 11:05   33K 

	Alternative "key combinations" are: Fast Ctrl+Shift+G Normal Ctrl+Shift+N Slow Ctrl+Shift+S

• MidiNotate Player 1.1.1
  
  screenshot | size: 4.01 MB | price: $0 | date: 5/27/2005
  ... Watch the notes as you listen.
  http://www.topshareware.com/MidiNotate-Player-download-36809.htm

• Notation Player 2.6
  
  screenshot | size: 4.49 MB | price: $0 | date: 5/11/2007
  ... Watch the notes as you listen.
  http://www.topshareware.com/Notation-Player-download-52020.htm

• 110222 1219 Iris Torres Music Sales Corp Schirmer NY eml
• 110224 1728 Kevin McGee Music Sales Mechanical Licensing Manager eml