Just posting to update this topic if anyone else shoud need it: the procedure above also works with the Roland MT-32. It is *so* much easier to get this to work in Scummvm where you get to choose midi output port on the Mac. In Dosbox it is extremely convoluted and the need for internal midi routing …

OMG...I figured it out. Posting this for future reference (or for any other Mac dosboxers with SC-55). It turns out that I had a small app called MusicDeviceHost running. It tends to mess up the audio drivers on my Mac when it sits in the background. When I shut that down, things started to look …

I'm new at these forums, please be gentle. :) I have a MacBook Pro running Macos Mojave. I bought a "real" Roland SC-55 mk2 which works fine with my Mac. The SC-55 is connected via midi cable to my external audio card which has DIN Midi in/out/thru ports. Scummvm has no problems sending all midi …