v0.4.0

Added

• Software "MIDI thru" for GPIO interface (new configuration file option).

Changed

• Update to circle-stdlib v15.1/Circle Step 42.1.
• Enhanced error reporting for GPIO MIDI parser.

Fixed

• Hanging/missing notes when GPIO MIDI interface used with some modern MIDI sources that transmit using Running Status optimizations.
  • Many thanks to @thorr2, @nswaldman, @icb-, @glaucon1984, @Braincell1973, @Higgy69, and @olliraa for patiently reporting, testing and brainstorming the cause of this critical issue.
• MIDI messages could be passed to mt32emu with the wrong length.