the amp-in at audio input is capture volume (Atten) control but the amp-
in at pin complex is boost (gain)

control.10 {
                iface MIXER
                name 'Capture Volume'
                value.0 63
                value.1 63
                comment {
                        access 'read write'
                        type INTEGER
                        count 2
                        range '0 - 63'
                        dbmin -5100
                        dbmax 1200
                        dbvalue.0 1200
                        dbvalue.1 1200
                }
        }
        control.11 {
                iface MIXER
                name 'Mic Capture Volume'
                value.0 3
                value.1 3
                comment {
                        access 'read write'
                        type INTEGER
                        count 2
                        range '0 - 3'
                        dbmin 0
                        dbmax 3000
                        dbvalue.0 3000
                        dbvalue.1 3000
                }
        }

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https://bugs.launchpad.net/bugs/950494

Title:
  [Macbook Air 3,2] headset mic not recognized

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