You are always better off with an analog volume control. You should always try to run your digital sections full tilt for maximum definition. Digital volume controls lose definition as you drop volume. Analog controls do not. I am not sure what the Mytec is doing. But if it is using an analog volume control another preamp would be a waste of money. Save it for a better amp, speakers, music or flowers for the wife.
Should I add a Preamp to my system
Tekton D.I. -> Parasound A21->myteK Brooklyn Dac using the digital audio potentiometer. Need for a Preamp or no. I had a Hovland and I think it sounded better but that could just be my brain not remembering quite right. If not I would like to put the money into a new Phono pre. Am I going to gain $4000 worth of better sound if I buy a pre?