Try Opts, Preferences, Midi Options, Midi Thru has to be checked.

I just tried it twice and then figured that out but it works just fine once I changed that.

On my system after that box is checked, there is a message in the top right corner about playback start waiting...it's large yellow.

Then when I touch a key playback starts. That's any key.

You can get fancier than that...but I'll look that up later.

John Conley
Musica est vita