Windows 10 Sound Mixer Overview

Two mixers, one job

sndvol.exe is a small floating window with vertical sliders, unchanged in layout since Windows Vista. The Settings panel is a full-page list with horizontal sliders and device dropdowns beside each app. Functionally they overlap for volume, but only the Settings panel lets you route an app to a specific speaker or headset. See windows-10-volume-mixer for a deep dive on the classic tool.

Opening either mixer

• Right-click the taskbar speaker icon > Open Volume mixer for sndvol.exe
• Settings > System > Sound > App volume and device preferences for the modern panel
• Win+R then sndvol.exe also works instantly
• Both mixers can be open at the same time; changes in one are reflected in the other since they read the same audio session data

Reading the sliders correctly

Each slider is relative to the app's own output level, not an absolute loudness. A media player at 100% mixer volume can still sound quiet if its internal player volume is turned down separately. See windows-10-per-app-volume for more on how these levels are stored per audio session.

Fixing a stuck or grayed-out slider

Grayed-out sliders often mean the app isn't currently producing audio, or the audio device it's bound to has been disconnected. Reopening the app or reselecting the output device in windows-10-app-volume-control usually resolves it. If the slider is missing entirely rather than grayed out, the app may not have played sound yet during the current session.

Sound Control Panel vs. the app-level mixers

Right-clicking the tray speaker icon and choosing Sounds opens the older tabbed Sound Control Panel, with Playback, Recording, Sounds, and Communications tabs. This is a different tool from either mixer — it manages hardware devices and system event sounds, not individual app volume.

When to use a dedicated app instead

If juggling two separate mixer tools feels clunky, EarTrumpet merges master volume, per-app sliders, and device switching into a single tray popup. See eartrumpet-for-windows-10 for details on installing and using it.

A few practical notes

It's worth remembering that neither mixer tool changes a device's underlying hardware volume ceiling — both simply scale an app's output relative to whatever level is set in the device's own Properties > Levels tab. If overall sound still seems too quiet even with every app slider at maximum, that hardware-level setting, not the mixer, is usually the place to check next.

Frequently asked questions

What's the difference between the sound mixer and volume mixer in Windows 10?

They're the same thing — different names for sndvol.exe, the classic per-app volume tool.

Why does an app's mixer slider stay grayed out?

Usually because the app isn't actively playing audio or its assigned device is unavailable.

Can I reset all mixer sliders to default?

There's no single reset button; you need to drag each slider back to 100% manually.

Is the Sound Control Panel the same as the sound mixer?

No, the Sound Control Panel manages hardware devices and system event sounds across separate tabs, while the mixer handles per-app volume.

Can both mixer tools be open at once?

Yes, sndvol.exe and the Settings panel can run simultaneously and stay in sync since they read the same audio session data.