Building a MIDI interface to receive data on the RX port of the 3.3V powered modules

Would the hardware side of such an expander be something as simple as what you detailed in this post about Grids?

Also, am I right in assuming Rings would need a custom firmware to implement this hypothetical expander?

This wouldn’t work, Rings’ UART lines have a 3.3V level.

Of course!

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How about this:

(maybe we should split this to a new topic)

Any reason why the 3.3v couldn’t be pulled off the jtag pin header?

Sure it can be done!