Unable to connect 2+ speakers in linkup mode

You have followed the how-to-guide on pairing two Minirig 4s together and they do not seem to connect

1. Ensure that you are connected to one of the Minirig 4s and it is playing music before you hold the volume - button.
2. Ensure the other speakers are NOT playing music when you hold the volume - button
3. Check the 4 bar BLUE LED pattern on the Minirigs - the pattern on the source and the other Minirigs should be different during the pairing process
4. Turn them all off and start again
5. Try making sure you are only paired and connected to the source speaker
6. Make sure the speakers are fairly close, around 1-5 meters apart