code: private void sendSyncControlCommand(DeviceUpdate target, byte command) throws IOException {
          ensureRunning();
          byte[] payload = new byte[SYNC_CONTROL_PAYLOAD.length];
          System.arraycopy(SYNC_CONTROL_PAYLOAD, 0, payload, 0, SYNC_CONTROL_PAYLOAD.length);
          payload[2] = getDeviceNumber();
          payload[8] = getDeviceNumber();
          payload[12] = command;
          assembleAndSendPacket(Util.PacketType.SYNC_CONTROL, payload, target.getAddress(), BeatFinder.BEAT_PORT);
      }
docs: Assemble and send a packet that performs sync control, turning a device's sync mode on or off, or telling it
  to become the tempo master.
  
  @param target an update from the device whose sync state is to be set
  @param command the byte identifying the specific sync command to be sent
  
  @throws IOException if there is a problem sending the command to the device