When i bought KK2.0 board i tried to assigned AUX channel to the board, so when you flip the switch A or B it will activate auto-level without stick input. I searched over google but couldn't find much info and it left me alone to tinker things myself. Somehow i found the way to assign switch to the AUX channel of KK2.0. I don't know whether it's true or not but works for me now on the ground. I haven't tested my KK2.0 flight yet. I will post results later but at this moment i will explain what i did. I am using Demo version of Digital Radio application.
http://www.sgr.info/usbradio/
PROCEDURE
1. First connect your radio to the USB port.
2. Open digital radio application.
3. Move tx sticks and make sure you are getting response to the respective channel bars in the application.
4. Now click on the "Get Settings" icon at the top. You will see "Synchronized" notification and it will fetch all current settings of tx now.
5. You will see two tabs "Main Data" and "Mix Data" in the application. In the main data tab you will see "Switch" panel. Select "Null" from the drop down box.
6. Now go to "Mix Data" tab and you will see "Variable" and "Mix1-2-3" panels. Select "Null" in the variable tab. Disable "Mix2" and "Mix3" and change following parameters in the "Mix1" and hit "Send Settings" button. It will save settings in the tx now.
7. Now move the VR(A) knob to the max.
8. Power up your KK2.0 and flip the switch! It should work for you.
http://www.sgr.info/usbradio/
PROCEDURE
1. First connect your radio to the USB port.
2. Open digital radio application.
3. Move tx sticks and make sure you are getting response to the respective channel bars in the application.
4. Now click on the "Get Settings" icon at the top. You will see "Synchronized" notification and it will fetch all current settings of tx now.
5. You will see two tabs "Main Data" and "Mix Data" in the application. In the main data tab you will see "Switch" panel. Select "Null" from the drop down box.
6. Now go to "Mix Data" tab and you will see "Variable" and "Mix1-2-3" panels. Select "Null" in the variable tab. Disable "Mix2" and "Mix3" and change following parameters in the "Mix1" and hit "Send Settings" button. It will save settings in the tx now.
7. Now move the VR(A) knob to the max.
8. Power up your KK2.0 and flip the switch! It should work for you.