* - PlaybackMixerElem
* - mixer element playback identifier
* - can be parsed using snd_use_case_parse_selem_id()
+ * - PlaybackMixerCopy
+ * - additional mixer element playback identifier
+ * - can be parsed using snd_use_case_parse_selem_id()
+ * - those elements should copy the volume and switch settings
+ * - element identifiers are separated using the | character
* - PlaybackMasterElem
* - mixer element playback identifier for the master control
+ * - can be parsed using snd_use_case_parse_selem_id()
* - PlaybackMasterType
* - type of the master volume control
* - Valid values: "soft" (software attenuation)
* - CaptureMixerElem
* - mixer element capture identifier
* - can be parsed using snd_use_case_parse_selem_id()
+ * - CaptureMixerCopy
+ * - additional mixer element capture identifier
+ * - can be parsed using snd_use_case_parse_selem_id()
+ * - those elements should copy the volume and switch settings
+ * - element identifiers are separated using the | character
* - CaptureMasterElem
* - mixer element playback identifier for the master control
+ * - can be parsed using snd_use_case_parse_selem_id()
* - CaptureMasterType
* - type of the master volume control
* - Valid values: "soft" (software attenuation)