newly downloaded audacity not recognize the “Tascam US144” midi interface for microphone source.
Why should Audacity (or any program) recognise a “MIDI” interface as a “Microphone” source?
Those two are very different things. The microphone has voice or music data. MIDI is trying to control a piano’s keys (for example).
“Press middle C for three seconds.”
That’s a MIDI command.
Audacity only has very simple support for MIDI and whatever you want is probably not going to be there.
However, the Tascam should work as an audio interface with Audacity if you plug-in a microphone, etc.