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A: Yes, you can drive one of the available digital output pins on the Feather with a small code change in the loop section of EmotiBit_stock_firmware.ino. Instructions to build EmotiBit firmware can be found in the documentation.
Note also that if you want to log the time of TTL pulse generation in EmotiBit's data stream, you can call addPacket similar to emotibit.addPacket(millis, "U1", (int) ledState, 1, 0). All typeTags from U0 to U9 will be perpetually kept free of other data streams so that users can utilize them for their own streams of data. A full list of all typeTags in use by EmotiBit firmware can be found in EmotiBitPacket.cpp.