It might also be worth making sure you have MIDI set up correctly in the Electro 4 itself. It needs to be set to use the USB out rather than the DIN plugs and have a channel number selected. And if you're trying to use the controls in Reaper not just the keyboard then you'll need to switch Local mode OFF (according to the online manual).
Can you try the keyboard with a different program, perhaps something like Audacity, to make sure it is working ?
Steve
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