1.0 - Initial release for ATMega168 processors as described on Spritesmods.com website
1.1 - Initial release for ATMega328 processors (pre-built cables, aka GBAMidimk2)
1.2 - Support running status; fixes dropped/hanging notes on some sequencers
1.3 - Fixes 'sweep speed' setting not initialized on bootup
1.4 - Added preset load/save code (start button). Debug screen is accessible by pressing left+right shoulder button.
1.5 - Added per-channel pan controls, added sample rate control
1.6 - Fixed channel4 being a few notes too low, added midi channel selection option