What will happen to my sound quality?

I am currently using a CA Azur 851n as a music server connected via balanced input to my Plinius 9200 intergrated amp. The Plinius has a processor loop, but no amp in connection. The CA can be set up to as either a music server or preamp, but the latter only for digital input sources, no analog inputs.
‘What will happen to my digital source sound quality if I change the CA settings to make it a digital preamp? Then I will have 2 preamps in series with the CA preamp out (analog) connected to the Plinius preamp input . Which volume control would I use to adjust the volume? Thx