Ferrofish Pulse 16 as slave

I’ve just added a Ferrofish Pulse 16 to my Neve 88M and all appears to be working well. But the screen on the Pulse says Master and the Audio settings on my Macbook say Neve is the Clock. Does this mean both devices are Master? I’ve read that you should choose one Master and I presumed the Neve should be it, but don’t see how to change Pulse to Slave. Thanks for any advice!