The JVC AX-A3 I have here has a CD Direct function which bypasses everything bar the volume control. With it in circuit there is a marked improvement in clarity, consequently I only ever use the CD input. I've no time for extraneous controls at all and have always preferred amps with just a volume control and source selector, the exception being the Classé DR5 pre-amp I previously owned where the same controls could be defeated at the flick of a switch. Needless to say they were never in circuit.