Four Stereo ADC Inputs with Analogue Gain Adjust from +24dB to –21dB in 0.5dB 
Steps
 Digital Gain Adjust from -21.5dB to -103dB.
 

table 10 of wm8775 mention that 0.5 dB per steps and min 0 is mute

As max 255 is +24 dB , 0xcf is 0 dB ,

step 1 is -103 dB



Source #1
        State: SUSPENDED
        Name: alsa_input.pci-0000_06_00.0.analog-stereo
        Description: CA0106 Soundblaster (SB0410 SBLive! 24-bit) Analog Stereo
        Driver: module-alsa-card.c
        Sample Specification: s32le 2ch 48000Hz
        Channel Map: front-left,front-right
        Owner Module: 8
        Mute: no
        Volume: front-left: 99957 / 153% / 11.00 dB,   front-right: 99957 / 
153% / 11.00 dB
                balance 0.00
        Base Volume: 26090 /  40% / -24.00 dB
        Monitor of Sink: n/a
        Latency: 0 usec, configured 0 usec
        Flags: HARDWARE HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY

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https://bugs.launchpad.net/bugs/1315212

Title:
  [CA0106 - CA0106, playback] Playback problem - Surround dies, no valid
  output

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