Available as an assembled Module and as a DIY project.
This Module is currently available.
Octave Shift with Adder
Included in 18 Racks, 7 are public:
Audio-Technica Case
INNUOS STATEMENT NEXTGEN
Denon SC LIVE 2 Standalone 2-Deck DJ
Quilter Aviator Cub 50-Watt 1x12"
WesAudio DIONE ng500 500 Series Stereo
Novation Launchkey Mini MKIII MIDI