I can change the output setting to be fixed going into my preamp and it works but the output is extremely low. I have to crank the volume almost to max to get any sound?
Crank up the volume on the rose to make sure it is really fixed. Also, I assume you selected the highest output setting? Lastly, if you use Roon, is volume fixed?
in-out settings, change the preamp out voltage settings.
try higher voltage.