No sound when using MIDI IN

[Yakoronor]

I just bought the Snow, and have been using it with Cubase for a couple of weeks without any problems (using USB and the TI plugin).

We're playing at a festival this saturday, and I wanted to take the Snow with me. I don't want to bring a computer, so I unplugged the USB and connected it to one of my keyboards using MIDI instead. I can see that the connection is fine, and things like program and parameter changes are received by the Snow - but I don't hear any sound!

I have tried to replace the MIDI cables, reset the module and I have even done a factory reset, but I just won't play any sound. If I connect it to my computer again using USB, it works just fine.

I have tried connecting it to various keyboards with no luck.

Does anyone know why this is? I suspect it has something to do with the audio outputs being in "USB Soundcard mode" or something, but I don't know. The global channel is set to the same as the transmit channel on the keyboard.