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A Y-splitter will work. Or it seems easy to post-process in GarageBand, as described here:


Open Logic Pro X Preferences Midi Reset All Midi Drivers Close and Reopen Logic Pro X to Check


Here's what works for me: Set the default startup action in Logic to 'Do nothing'. Start Logic. If the Coremidi error message occurs, quit and restart Logic instantly. Voilá, no error this time. my setup is: Mac Mini 2018, osx 10.14.5 (Mojave) Intrestingly, this error never came up for a month since i started using Logic. At one point, my 2 year old ...

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