Vestax PBS-4 This little box will handle video inputs from HDMI (x1) composite (x4) and a VGA input, you can switch between input sources (up to four at a time) and mix audio out to the USB connection. This shows up as a USB camera device for streaming out to services like LiveStream, Ustream etc.
Priced at around €469
I guess I've been trying to recreate a Korg Electribe all this time..
Live sax processing, sequencing and modular all together