Piezo uses diamonds (if I am correct) in the saddles to pick up and acoustic sound...with Piezo equipped guitars, you can plug your guitar out as an electric (through the pickups) and an acoustic (through the piezo pickup system) this allows you to get electric and acoustic sounds from your guitar...and a blend of the two.
Midi pickups basically allow you to connect to midi products, such as the Roland Gk 20, and so on...the possibilities with midi connectivity are endless...you can basically make any sound you want with your guitar...sorry thats the best I can do.
[FONT=Century Gothic]Hope is when we feel the pain that makes us try again[/FONT]
