Up2Stream Plate Amp and Up2Stream Amp Sub not saving settings

I have a Up2Stream Plate Amp and Up2Stream Amp Sub that are grouped and managed by the 4Stream app. After adjusting the relative levels of the Plate Amp and Sub and then turning both systems off, when I return, I find that the relative levels have not been saved and I have to readjust them.
Is there a way to save these settings more permanently?