Output ports gain will not save with song

Away from my computer so I can’t attach a screenshot,but I want the master output gain for “output ports” to save with the song. In other words I want to raise all the racks volume.
Under output ports state behavior I have all three options checked, output gain, user notes, and color. I then increase the output ports slider to, for example, +3db. Save all. Go back to another song, go back to this song, and the +3 did not save, it’s at 0 dB. I played around with a binding…song, on load, 0 delay, targeted song, output gain…but I couldn’t find a way to enter a value. Thanks! Tom