Hello Kingwa, I am glad to have been a little bit helpful for this, and am happy to see you were able to find a good solution so quickly.
I am curious if you plan to apply the same fix to the SA-31SE which now has a 17DB jump from low gain to high gain?
Alternatively, can the 5-button Audio-GD remote (that does not have the gain button) be ordered along with the SA-31SE or the Precision 1?
The SA31SE also can have this function.
And they can select applied the 5 button remote controller but want to custom order , the mute button on the remote can change to gain function.