At the moment the USB MIDI input needs to be connected to a host, i.e. laptop, iOS app, unless using a Kenton MIDI device etc. so would not work directly as a MIDI synth, for example, from a MIDI keyboard’s USB port.
I could buy the extra Kenton hardware (I still use my control freak from 1999 btw!), but has somebody made a suitable MIDI device on an arduino or similar that would be a cheaper way of connecting the pin(s) of a MIDI 5pinDin output from standard MIDI hardware device to the USB input (or expression pedal input) of the owl?