snd_ctl_make_virtual_master(9)

✨ snd_ctl_make_virtual_master(9) ✨

okay bestie, so this one lives in the Kernel API Manual, section 9, and it's lowkey one of those functions that sounds fancy but is actually super chill once you get it 🫶

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🎀 NAME 🎀

snd_ctl_make_virtual_master — literally just: create a virtual master control 💅

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🌸 SYNOPSIS 🌸

struct snd_kcontrol * snd_ctl_make_virtual_master (char *name , const
       unsigned int *tlv );

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🦋 ARGUMENTS 🦋

• name — the name string for the control element you're creating ✨ like, that's its whole identity, give it a good one.
• tlv — an optional TLV int array carrying the dB info 🎚️ not required, but if you've got it, flaunt it.

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💖 DESCRIPTION 💖

So what it does: it creates a virtual master control with the name string you passed in. That's the whole vibe 👑

Once your vmaster element exists, the next move is adding follower controls to it — and you do that through snd_ctl_add_follower or snd_ctl_add_follower_uncached. Two options, both iconic, pick your fighter 🌈

Now about that optional tlv argument — it's how you specify the TLV information for the dB scale of the master control. And there are rules, so listen up 🙈 it should be a single element with #SNDRV_CTL_TLVT_DB_SCALE, #SNDRV_CTL_TLV_DB_MINMAX or #SNDRV_CTL_TLVT_DB_MINMAX_MUTE type, and it should be the max 0dB. That's the spec, no cap 💀

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⭐ RETURN ⭐

You get the created control element back — or NULL for errors (specifically ENOMEM, bestie, memory said no 😭).

fr fr though: if you see NULL, don't go dereferencing it, that's not the moment 💀

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🧚 SEE ALSO 🧚

Kernel file ./sound/core/vmaster.c — plus all these other baddies:

• snd_ctl_add_followers(9)
• snd_ctl_add_vmaster_hook(9)
• snd_ctl_sync_vmaster(9)
• snd_ctl_apply_vmaster_followers(9)

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🌟 the cute sign-off 🌟

this masterpiece of a page came from ./sound/core, dated October 2026, and it's filed under snd_ctl_make_virtual_master(9) — go forth and virtualize your masters, queen 🎀🦋💜