Hi,
By default the APC-MINI lights do not light up. You need to send MIDI data to them to light them.
The attached post should help. It mentions Dot2 however neither GrandMA nor Dot2 send MIDI feedback by default so you would either need to script it (in Lua) or use MIDI Translator to provide LED feedback as shown by the example in the below post.
Steve Caldwell
Bome Customer Care
Also available for paid consulting services: bome@sniz.biz