Analogue Input Glitch


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?  


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