There used to be a small Windows utility that you could use to test physical MIDI interfaces for all sorts of timing issues by connecting the input and output together, it was called MIDITest but it seems to have disappeared from the internet.
There used to be a small Windows utility that you could use to test physical MIDI interfaces for all sorts of timing issues by connecting the input and output together, it was called MIDITest but it seems to have disappeared from the internet.