My right hearing is worse than my left so I only have 7.5 dB reserve gain on my right and 10 dB reserve gain on my left. You can see it on the screen shot below (on the upper right and upper left corners). BUT, my default volume is 64% on both left and right side in ALL 4 of my programs. So what happens is that as I increase the volume, both my left and right volume would increase in concert with each other, but I can only go up 3 more notches before my right OPN stops increasing (because its reserve gain has been exhausted). Meanwhile, I can go up another notch on my left OPN before it’s maxed out. It’s very obvious to see this via the ON app on the iPhone.
NOW, if from this point of max volume where both the right side and left side volume are now skewed by 1 notch, I decrease the volume on both side, their volume level will continue to be skewed by 1 notch all the way back to default, and continues to be skewed if I continue to decrease the volume down all the way to 0.
The only way to undo the volume skew once it gets skewed is to switch to another program, then the volume gets reset to the default 64% in the new program, and they move in concert again with the same volume level, until/unless I go all the way to maximum again and cause them to be skewed again.
I don’t think that the use of Speech Rescue is causing a reserve gain difference like what your audi said. From what I can tell, I didin’t have a reserve gain difference until I started running the feedback analyzer. As you can see on my screen shot below, the feedback analyzer causes the margin between the amplification and the gain suppression for feedback removal to shrink considerable on my right OPN, while there’s still plenty of margin left on my left OPN. From what I can tell, THAT’s what creating a reserve gain difference in my case.
Also, I have this reserve gain difference for all my 4 programs, despite the P4 being the Music program and therefore does not have Speech Rescue turned on. I can toggle Speech Rescue on and off in any of my 4 programs in Genie 2 on the fly and I don’t see the reserve gain change at all.