How change Linn Classik signal strength threshold?

Dear All,

I have a Linn Classik. For FM and AM reception, the audio is muted when the signal strength falls below a certain threshold. I can't lay my hands on the manual at the moment. How do I change this threshold (preferably to the setting letting me hear all stations, regardless of signal strength)?

Many thanks.
There should be an FM mute of distance local switch. did you check the Linn web site for a pdf manual?