CD player with variable output

The older Sony's like the XA7ES and much older versions like the 707, 777 etc all had a remote control pot. They were very well built but older technology.

As mentioned in the earlier post, also be careful how the volume control has been implemented in the cdp. If the attenuation is done in the digital domain like the New Tube 4000 and majority of the cdp's, then at lower vols there is loss of resolution and the preformance is greatly compromised.
If the attenuation is in the analog domain, then you are safe.
Few players like Resolution Audio, Sony's, Quad 99 cdp have it and sounds fantastic. Some have buffers after the vol control which give better drive and dynamics.