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I don't know if Horizon and the BCF are compatible. I can tell you, however, that LightJockey has a plug-in for the BCF. I don't think it's written by Martin, but by end users. It is, however, available through the Martin site, which says they think it's stable enough to offer it. As for other LJ plug-ins, Paul Pelletier wrote a 512 channel fader board, but it doesn't work for me. There's also a plug-in for the X-Keys joystick controller (no idea if it works), LJ Manager (works very well), and the old Fingers console, which was an actual Martin product. Fingers can be run as a virtual device, but you can't use it on a touchscreen so it kind of defeats the purpose. The hardware version works fine, although there is very limited programming abilities. The other thing is the hardware version is discontinued so good luck finding one.