I've a midi keyboard going to 'midi in' on a Focusrite 18i20 USB'd to Reaper on a PC. I can record a midi track using Reaper with this keyboard. I can also play back the track on an external midi sound module connected to 'midi out' on the 18i20.
The only problem is, I don't get midi to the sound module when I'm actually playing the keyboard. I can see Reaper's midi meter moving, but theres no sound from the module.
There used to be a concept of 'midi through' which is essentially the feature I want, in other words I want the midi data that is going to the PC to also go (approximately) simultaneously to the sound module. There's no way of controlling what the 18i20 does, so I assume this has to be done by Reaper echoing everything, but I can't find out how to do this. There's no mention of 'midi through' in the Reaper manual.
Just to be clear, no VSTs are involved.