I tried the volume boost. I find it really distorts the sound when listening on certain setups, I listen on headphones and in my car mainly. In the car I find the EQ gets very muddled when using the volume boost compared to the Preamp.
I know you dont have much control over this. I am also totally lost on what is causing the preamp to disable upon change. I have disable all system settings that might interfere (Dolby Atmos, Volume normalization on system level etc)
I installed Poweramp Equalizer and I have consistent preamp now.
Is there anything you can rework on Sysmfonium side to get the same result? I know you said that there is not much control over it, but, poweramp does work. I know its a dedicated app to do 1 thing so redoing the processing engine of symfonium is mabye out of the reality scope. I still want to ask though.