Sounds like gustard are saying not to use the volume control which is a shame would be nice to bypass a normal preamp and keep signal path short ,i see this a lot with digital attenuators and i presume they dont design a discrete stage so it doesnt impact measured performance,its a shame Amir does not focus more on this.
Amir, sooner or later, will have to give a good thought to his work to keep adding value. A big veritical line on the SINAD charts, at the lowest DB the best human ear has been able to discern would help to put the focus in the places where exist room for improvement.