Hi,
Thanks for this project.
If I understand correctly this project allows us to convert a good old MIDI host in a USB-MIDI host?
Would you mind add some docs about use cases?
I'm personally looking for a way to give a recent USB-MIDI device a good old DIN MIDI out.

Christophe

I have noticed, when trying to play many notes at the same time, the whole system cannot manage to process them all.

It's mostly annoying when a NOTE OFF message gets lost and you get constantly playing note on your synthesizer etc.

The best way to reproduce is to use MIDI controller with a built-in arpeggiator. Set the tempo to 60+ BPM and division to 16th and literally just press one key.
You'd notice the synthesizer/instrument playing very very swingy, nowhere near the expected BPM and time division.

Other way is just to continuously press one key and observe the behaviour of the instrument. The note will be ignored at times, and play continuously at others.

Is there a way to make the MIDI transmission more robust? If high BPM cannot be supported, is there a way to at least make it not lose the messages?

Looks like SN74AHCT125 isn't available anymore. Can you suggest any replacements?

Hi,
Very interesting project, but not sure I am understanding the USB operation.

It looks like the M0 does not have the ID wire connected, so does this mean that the f/w is forcing it into USB Host Mode? If so, what is the recovery process for when 'we' want to upgrade the f/w or purpose for something else?

Looking at the pictures here:
https://learn.adafruit.com/adafruit-trinket-m0-circuitpython-arduino/overview

It looks like the D+/D- are also available as pads on the underside. Yes! This would make it much simpler to use in my project to host a Midi keyboard for my Uno Synth (2.5mm Midi in).

Just a regular USB Type A->Type Micro B cable cut D+/D- 1/2 way and solder direct to pads, then GND/VDD are shared between all Type-A, M0 and Type-miniB.

Any recommendations for a SMT single gate buffer chip for Midi UART out?

Thinking this (and the resistors) could just be super/crazy glued to underside of PCB with flying lead to Uno.

Cheers,
Simon