Currently, mixerctl.conf(5) says Most devices have a number of digital to analogue converters (DACs), used for sound playback, and each DAC has a corresponding output mixer. The mixers are labelled “mix” or “sel”.
That doesn't seem to be the case, at least not universaly as the wording seems to imply. For example, this is mixerctl output on a Thinkpad T400: inputs.dac-0:1=222,222 inputs.dac-2:3=222,222 inputs.beep=0 record.adc-2:3_source=mic2 record.adc-2:3=219,219 record.adc-0:1_source=mic record.adc-0:1=219,219 outputs.hp_source=dac-0:1 outputs.hp_boost=on inputs.mic=189,189 outputs.mic_dir=input-vr80 outputs.spkr_source=dac-2:3 outputs.spkr_eapd=on inputs.mic2=189,189 outputs.hp_sense=unplugged outputs.mic_sense=unplugged outputs.master=240,240 outputs.master.mute=off outputs.master.slaves= record.volume=240,240 record.volume.mute=off record.volume.slaves= record.enable=sysctl Apparently, it has two DACS (for the speakers and the headphones). The current wording might confuse the user into thinking he has no output mixer, but the inputs.dac-0:1=222,222 inputs.dac-2:3=222,222 do control the respective volumes, while no "mix" or "sel" exists. Similarly for recording via the two ADCs. Jan Index: mixerctl.conf.5 =================================================================== RCS file: /cvs/src/share/man/man5/mixerctl.conf.5,v retrieving revision 1.10 diff -u -p -r1.10 mixerctl.conf.5 --- mixerctl.conf.5 21 Apr 2020 21:32:26 -0000 1.10 +++ mixerctl.conf.5 17 Oct 2020 15:31:23 -0000 @@ -66,10 +66,6 @@ TOSLink, RCA, or 1/8" mini stereo. Most devices have a number of digital to analogue converters (DACs), used for sound playback, and each DAC has a corresponding output mixer. -The mixers are labelled -.Dq mix -or -.Dq sel . Each DAC represents two channels of playback. .Pp Verify that playback works by playing an audio file @@ -104,10 +100,6 @@ shows the number of channels available. Most devices have a number of analogue to digital converters (ADCs), used for recording sound, and each ADC has a corresponding input mixer. -The mixers are labelled -.Dq mix -or -.Dq sel . Each ADC represents two channels of recording. .Pp Connect line in on the audio card to an audio source,