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pcm.4: Document dev.pcm.%d.eq*

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Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Pull Request:	https://ron-dev.freebsd.org/FreeBSD/src/pulls/15
This commit is contained in:
Christos Margiolis
2026-04-17 17:47:44 +02:00
parent 3a3cb16ad4
commit 98a62ccab6
1 changed files with 11 additions and 0 deletions
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share/man/man4/pcm.4
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@@ -430,6 +430,17 @@ the definitive format/rate target.
The recommended way to use bitperfect mode is to disable VCHANs and enable this
sysctl.
Default is disabled.
.It Va dev.pcm.%d.eq
Set to 1 or 0 to enable (1) or disable (0) the equalizer.
Default is disabled.
When enabled, the mixer bass and treble controls can be used, as well as the
.Va dev.pcm.%d.eq_preamp
tunable.
.It Va dev.pcm.%d.eq_preamp
Equalizer preamp (in dB).
.Va dev.pcm.%d.eq
has to be enabled, in order for this tunable to take effect.
Read the tunable's description to see the available range of values.
.It Va dev.pcm.%d.[play|rec].vchans
Enable (1) or disable (0) VCHANs.
Default is enabled.