What do the source button LEDs indicate?

LED Location LED State Definition
Bluetooth (BT) 1 or 2 Solid white Source has been selected on the speaker. Only one source can be selected at a time.
Bluetooth (BT) 1 or 2 Blinking white The source is in pairing mode and the speaker is ready to be paired.
Optical or Aux  Solid white Source has been selected on the speaker. Only one source can be selected at a time.