To do this, go to Command Page and select “BMS .key file” from the Keyboard menu. Click on Load to open your BMS .key file and you will see the list of all the callbacks already assigned. When you click on one of them, the software will read and display the key combination. To assign it to one of your switches, pushbuttons, etc, just click on Replace.
Edited on April 10th, 2016
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From version 0.9.9 you can also assign commands from a drop down list directly in the element matrix by clicking on it with the right button of the mouse once you have loaded the .key file:
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Regards,
Shep