[Bob van der Poel]
​bob$ aconnect -i
client 0: 'System' [type=kernel]
0 'Timer '
1 'Announce '
client 14: 'Midi Through' [type=kernel]
0 'Midi Through Port-0'
client 24: 'USB Uno MIDI Interface' [type=kernel]
0 'USB Uno MIDI Interface MIDI 1'
[08:20 PM ~] bob$ aconnect -o
client 14: 'Midi Through' [type=kernel]
0 'Midi Through Port-0'
client 24: 'USB Uno MIDI Interface' [type=kernel]
0 'USB Uno MIDI Interface MIDI 1'
client 128: 'Juce Midi Input' [type=user]
0 'Juce Midi Input '
So, being pretty smart I try:
bob$ aconnect 64:0 128:0
Connection failed (Invalid argument)
At this point I give up and post on LAU.
Surely you meant to write
$ aconnect 24:0 128:0
assuming "USB Uno" is connected to your keyboard?
Cheers, Tim