Cherry Audio Forums

I'm using Reaper, and when I try assigning the MIDI output ports on the MIDI Out module to my hardware MIDI outputs, I get the message 'Unable to open MIDI output (port name)'. The MIDI works for everything else, and with the standalone version I can assign the ports.

Hi,

Most midi devices only allow one app or program to open it at the same time. Using Voltage's midi modules have the same issue. Ensure that Reaper is not using that midi device and that could help

That's was what I originally thought it was, but it happens when there is there is nothing else running, and just a single track with a MIDI Out module in Reaper.