Vintage harmony electric guitars of the instrument amplifiers badged with the Harmony name were manufactured by Sound Projects Company of Cicero, Illinois. Not only was this guitar a beauty, but it played like a dream. But back to the Kawai. From Wikipedia, the free encyclopedia. Through either my Deluxe Reverb, or my SilvertoneI can get a nice rock clean by rolling off the volume knob, and a great overdrive by turning up. I have dreams of making a copy of it.