I was able to get a small amount of diagnostic info from MidiPrimTester:

tester := MidiPrimTester new.
MidiPrimTester initialize.

tester getDriverParameters
'
Installed = 0
Version = 0
HasBuffer = 0
HasDurs = 0
CanSetClock = 0
CanUseSemaphore = 0
EchoOn = 0
UseControllerCache = 0
EventsAvailable = 0
FlushDriver = 0
ClockTicksPerSec = 0
HasInputClock = 0
MIDI Echoing is not supported.
Controller Caching is not supported.
'
tester getPortList
'
MIDI Ports:
0: Keystation Mini 32 MK3 <port:0> (out)
'

On Thu, Feb 3, 2022 at 7:17 PM David O'Toole <deeteeoh1138 at gmail.com> wrote:

> 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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