The DH-500 uses the same basic synthesize as the DH-200, but it adds a neat adjustable reverb effect that adds a lot of color to the sound. There is the option of turning the vibrato on and off. The DH-500 has two octave buttons. The top one raises the pitch an octave just like on a real sax. The bottom one lowers the pitch an octave. There is a slide switch on the back to select the voice. There are UP and DOWN transpose buttons and an LED indicator There are external adjustments that allow to set the breath sensitivity There is also an external adjustment that allows tune the horn. The DH-500 has the Eb key on the right hand and also a B key on the left hand.