That's very interesting but it is a cancelled project. And USAMO only does sync right? Not notes and cc's?

USAMO seems to encode everything.

https://www.expert-sleepers.co.uk/usamo.html

I don't own one, but it looks like it's bridging the whole MIDI signal on a high bandwidth (audio) stream between the computer and the MIDI gear. Kinda like LTB from Steinberg did, except the later worked within the USB 1.1 enveloppe.

You still can get the E-rm (nowadays called the Floatingpoint Instruments multiclock) that you can sync using an audio signal by a VST in your DAW.
In that sense it is kind of a hybrid solution. But it works for most solutions.
Mind you that on the receiving ends not all synths are perfect either. Some synths are a breeze to sync with while others are way too sensitive. *cough* *MoogOne* *cough*

Even if Midi 2.0 would be put out just for getting a stable midi clock it already would be worth IMHO.
It wouldn't fix the issues at the receiving end but sure as heck would solve a lot of sending challenges.

Most likely developing these interfaces take their time and OS support will factor in too.
Lets just hope that these products will show up soon.

Floating Point (formerly ERM) Multiclock is clock only.
Very cool, I had never looked into it since most folk use it for clock. Reliability depends on the audio interface but they have a table with all the details. Need to think about how to integrate it in my setup. Would need a MIDI patchbay, or lots of money to have one for every receiving synth, plus the USB for receiving sysex, and I only have 7 such devices

I don't see one for general purpose personal computer platforms, this is not their priority. The problem for small specialised companies developing workarounds is that when the major companies move the goalposts they are left high and dry with years of work and investment wasted. Anything requiring software for a commercial computer means a commitment to support it through every future change. Endless re-work to keep the same product. Look how many times Apple have changed their CPUs in the last 20 years...

Yes, I make one: Gearbox. The problem with using audio tones is exactly the same as when they were used for tape machine synchronisation: any drop out puts you behind and any noise puts you ahead because every edge in the signal matters. Also start/stop information needs another channel. I have one customer using it for live performances who puts a start pulse on every bar to generate a reset pulse to synchronise analogue sequencers just in case there is an audio glitch in the clock tone. Of course, any glitch in that audio channel would have the opposite effect.

I did work out how to do a Tempo Code that would work like SMPTE LTC, but I couldn't see enough people willing to buy it that would pay for the development. A box to "stripe" a track and decode it would cost as much as a tape machine synchroniser.

For most people the solution is cheap: record the synth output in a DAW and edit it.

No
The product is still on the market and I've had death threats from the company before.

It is pretty easy to check MIDI performance with an oscilloscope or just record it into a DAW track. Obviously 31k25Hz digital signals don't go through an audio anti-aliasing filter intact, but you will see enough to recognise a clock byte and a note message.
Wiring details are here: HINTON INSTRUMENTS: Professional MIDI Guide (Page 5)

Ah! That gives us a shortlist though...

A Midronome is far better. Erm has more ports than a Midronome and a little more functionality (gap closing) but costs more… and Midronome v1 is sold out (new batch with improvements coming).

The Midronome does MIDI clock, start/stop and DAW sync cheaper than ER-M and InnerClock's. That's Simon's niche. There are alternative hardware MIDI clocks, MidiGAL, CLOCKstep, etc.

USAMO and enhanced (proprietary) USB MIDI protocol with timestamps are different beasts, entirely.

Seems you may need to learn more about the Midronome. Or perhaps we’re talking about different things.

At any rate, I was very happy to replace my USAMO with it.

I'm glad that it's working for you.
It's a very sharp MIDI clock indeed, as per my measurements:
https://gearspace.com/board/product-...l#post16593358

Yet, not the same thing than the USAMO at all