I have never seen this hardware previously, and I think it may be something relatively new from ES. I am posting it because I looked it up and found a relatively basic answer about what the USAMO is:
The Expert Sleepers USAMO (Universal Sample-Accurate MIDI Output) provides a sample-accurate, jitter-free MIDI output from your DAW.
The MIDI signal is generated by the USAMO software, a plug-in which runs as a virtual instrument (AU/VST/AAX, Mac & Windows), as audio in your DAW. The DAW sends MIDI to the plug-in; the plug-in translates that to audio and sends it to the USAMO hardware, via an output on your computer’s audio interface. The USAMO then reconstructs the MIDI and outputs it on a standard 5 pin DIN MIDI socket.
In addition to MIDI note and controller data from the DAW, the USAMO software also generates MIDI clock, Song Position Pointer etc. It can also handle Sysex.
Because the MIDI signals are generated and transported as audio, they are guaranteed to be sample-accurately synced with your audio, and free of the jitter often associated with computer-generated MIDI
So I know what it does, but that seems like a job many already existent audio interfaces can take on, like the MOTU M4, PreSonus iTwo, or many of the other similarly affordable externals that cost not much more than this (seemingly) singularly focused MIDI only device.
It made me curious enough to wonder about, but I can’t ask a search engine the way I can just pose a question here. I was just wondering if anyone knows anything about this?