Comment 2 for bug 1497666

control.5 {
  iface MIXER
  name 'Analog Front Playback Volume'
  value.0 207
  value.1 207
  comment {
   access 'read write'
   type INTEGER
   count 2
   range '0 - 255'
   dbmin -9999999
   dbmax 1200
   dbvalue.0 0
   dbvalue.1 0
  }
 }
 control.6 {
  iface MIXER
  name 'Analog Rear Playback Volume'
  value.0 207
  value.1 207
  comment {
   access 'read write'
   type INTEGER
   count 2
   range '0 - 255'
   dbmin -9999999
   dbmax 1200
   dbvalue.0 0
   dbvalue.1 0
  }
 }
 control.7 {
  iface MIXER
  name 'Analog Center/LFE Playback Volume'
  value.0 207
  value.1 207
  comment {
   access 'read write'
   type INTEGER
   count 2
   range '0 - 255'
   dbmin -9999999
   dbmax 1200
   dbvalue.0 0
   dbvalue.1 0
  }
 }
 control.8 {
  iface MIXER
  name 'Analog Side Playback Volume'
  value.0 205
  value.1 205
  comment {
   access 'read write'
   type INTEGER
   count 2
   range '0 - 255'
   dbmin -9999999
   dbmax 1200
   dbvalue.0 -50
   dbvalue.1 -50
  }
 }

dB min is -99999.99 which is equialemnt to mute

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/include/sound/tlv.h

#define TLV_DB_GAIN_MUTE -9999999

http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=include/control.h;hb=HEAD

 /** Mute state */
 #define SND_CTL_TLV_DB_GAIN_MUTE -9999999

https://bugs.freedesktop.org/enter_bug.cgi?product=PulseAudio

 you have to open pulseaudio bug report if pulseaudio dB min is less than -99999.99