For [SimpleMIDIPort midiIsSupported] i get 'true', but [SimpleMIDIPort
inputPortNumFromUser] answers nil and [MIDISynth example] etc don't work. I
get PrimitiveFailed on #primMIDIReadPort. MIDI output port appears to show
up in AconnectGUI, but no input port.

I checked the "Plugins" section of the "About Squeak" dialog, and the MIDI
plugin is loaded.

What am I missing? I would greatly appreciate any help you can offer in
getting things working.
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