amixer set 'Master',0 92%,92% unmute  #play a sound
Simple mixer control 'Master',0
  Capabilities: pvolume pvolume-joined cvolume cswitch cswitch-joined
  Playback channels: Mono
  Capture channels: Front Left - Front Right
  Limits: Playback 0 - 100 Capture 0 - 31
  Mono: Playback 92 [92%] [-3.20dB]
  Front Left: Capture 29 [94%] [-3.00dB] [off]
  Front Right: Capture 29 [94%] [-3.00dB] [off]