Changes in OC4BA_XP v1.2 to OC4BA_XP_v1.21 are all for laminar/zibo B737-800
1. EFIS range switch is now working
2. SPD INTV and LAT INTV are both implemented. Can be used for those having the OC MCPv3 or later
3. MCP Bank switch is implemented by a looong push on HDG knob. Another loong push set the knob back to HDG.
4. VNAV led should work OK
5. HDG switch is now working OK.