The hard drive also makes finding and playing midifiles much faster than only using the floppy disk drive which is includeded in both models but now a days very outdated. In your church, do you have a midi keyboard which you can plug into the SD3? If yes you can use the module and if no you should be looking at a keyboard with all the arranger features.

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George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566
www.kayesmusicscene.com