Around 2004, Suzuki came out with its unique SCT-128, 16 channels, 128 reeds tremolo chromatic. The patent #DE 20 2004 004 616 U1 was granted the same year
It is the only double-reed chromatic harmonica commercially available.
The main reeds are tuned to around A=444/445, with the secondary reeds tuned a fraction lower, giving it the characteristic tremolo effect.
Chromatic Harmonica History 