code: @Override
      public boolean isTempoMaster() {
          DeviceUpdate master = VirtualCdj.getInstance().getTempoMaster();
          return (master != null) && master.getAddress().equals(address);
      }
docs: Was this beat sent by the current tempo master?
  
  @return {@code true} if the device that sent this beat is the master
  @throws  IllegalStateException if the {@link VirtualCdj} is not running