I am using a Pi3-B / DAC+ADC / AAMP60 with HifiberryOS. The ADC analogue input works properly however there is a glitch with selecting it. If any other source is playing at the time I switch on the analogue input on, I hear a loud pulsing noise. This noise stops when I turn the analogue input off. The work around is to pause the other source before turning the analogue input on; then there is no problem.
Is this a known issue that others are experiencing?