Windows 10, Reaper, Overbridge 2.3.9 no sound


After some messing about I’ve got overbridge 2.3.9 installed. I’ve found the correct plugin so the VST is on 2.3.9 also. When i move the knobs on the hardware it updates on the software and vice versa perfectly.

The heat doesn’t receive any sound - i get a microscopic flash of signal every now and then on a loop in reaper but aside from that it doesn’t get any audio in at all.

Any ideas?

Reaper / Windows 10