mmsys.cpl: Step-by-Step Guide to Windows Multimedia Control Panel

mmsys.cpl is the Windows multimedia control panel, the classic Sound window with Playback, Recording, Sounds and Communications tabs. Press Windows key + R, type mmsys.cpl (or control mmsys.cpl) and press Enter to open it on Windows 11 or Windows 10.

Below: every way to open it on Windows 11 and Windows 10, how to set default speakers and microphones, how to change system sounds and call ducking, and symptom-by-symptom audio fixes.

How to open mmsys.cpl in Windows 10/11

The Run box works the same way on Windows 11 and Windows 10, from the desktop or with any app open.

1. Press Windows key + R to open the Run box.
2. Type mmsys.cpl or control mmsys.cpl. Both open the same window.
3. Press Enter or select OK.
4. The Sound window opens on the Playback tab. Select another tab at the top to manage microphones, system sounds or call behaviour.

What is mmsys.cpl in Windows?

mmsys.cpl is the Control Panel module behind the Sound item. Microsoft's developer documentation calls it the Windows multimedia control panel, and its Control Panel reference lists the module as %SystemRoot%\System32\mmsys.cpl with the canonical name Microsoft.Sound.

Windows 11 still ships it. The Settings app links straight to it from System > Sound > More sound settings, because several device options exist only here. It is one of several .cpl modules still in Windows, alongside appwiz.cpl for Programs and Features. Another is joy.cpl, the Game Controllers window you use to reach the Thrustmaster Control Panel for a racing wheel.

Tab	What it controls	Typical job
Playback	Every output device: speakers, headphones, HDMI monitors, Bluetooth audio	Pick the default speakers, enable a disabled device, change the output format
Recording	Every input device: built-in, USB and headset microphones	Pick the default microphone, check that a mic is enabled
Sounds	The sound scheme: the sound Windows and programs play for each event	Change or silence a notification, such as New Mail Notification
Communications	What happens to other audio when a call starts on the communication device	Stop music fading during calls, or mute it completely
Canonical name	Microsoft.Sound	Open the panel with control /name Microsoft.Sound

How to open mmsys.cpl step by step

Every route below lands on the same Sound window. Pick the one that matches where you already are.

Route	What to do	Best when
Method 1: Open mmsys.cpl from the Run dialog	Windows key + R, type control mmsys.cpl, press Enter	Your hands are on the keyboard
Method 2: Open it from Windows 11 Settings	Start > Settings > System > Sound, scroll to Advanced and select More sound settings	You are already in Settings and need a tab it does not have
Method 3: Open it from Command Prompt, PowerShell, or Windows Terminal	Type control mmsys.cpl or control /name Microsoft.Sound and press Enter	You are at a prompt or writing a script
Method 4: Open it through Control Panel	Type control panel in the taskbar search box, open it, then select Hardware and Sound > Sound	You prefer the mouse and Category view
Open it from Windows Search	Select Start, type sound and select Change system sounds	You want the Sounds tab first
Open it from Task Manager	Ctrl + Shift + Esc, File > Run new task, type control mmsys.cpl	The taskbar or Start menu is not responding

1. Launch it faster from Run

Press Windows key + R, type mmsys.cpl and press Enter. This is the only route that works the same on every Windows 11 and Windows 10 build, and it also works from Task Manager > Run new task when the taskbar is frozen.

2. Start with the Windows 11 Settings route

Select Start > Settings > System > Sound. Scroll to Advanced and select More sound settings; Microsoft’s own audio troubleshooting steps use this link to reach the Playback and Recording tabs.

3. Jump through the modern Sound page

Right-click the speaker icon on the taskbar and select Sound settings, or run ms-settings:sound from the Run box. Both land on the same System > Sound page, where More sound settings opens mmsys.cpl.

4. Find it from Control Panel search

Open Control Panel, type sound in its search box at the top right, and select Sound, or select Hardware and Sound > Sound in Category view.

Skip outdated Sound Control Panel shortcuts

Older guides tell you to right-click the speaker icon and choose Playback devices or Sounds; Windows 11 no longer shows those entries. Do not type mmc mmsys.cpl either: mmc.exe opens management consoles (.msc files), not Control Panel items.

The Microsoft reference gives the full form as %systemroot%\system32\control.exe /name Microsoft.Sound, which is useful as a desktop shortcut target. Every other way into Control Panel is covered separately.

Open mmsys.cpl directly to the Recording or Sounds tab

Add a tab number after two commas to open the Sound window on a specific tab. Type any of these in the Run box or a terminal:

Command	Opens on
control mmsys.cpl,,0	Playback
control mmsys.cpl,,1	Recording
control mmsys.cpl,,2	Sounds
control mmsys.cpl,,3	Communications

Put the same text in a desktop shortcut’s target box to make a one-click shortcut to your microphone list.

How to use the mmsys.cpl multimedia control panel

Each tab of the Sound window does one job. Select a device and use Properties for its settings, right-click it for default and enable/disable options, and select OK or Apply to keep a change. Nothing changes until you confirm.

• Playback: choose and configure speakers and headphones.
• Recording: choose and configure microphones.
• Sounds: change or silence Windows alert sounds.
• Communications: decide what other audio does during calls.

Managing playback devices and default speakers

The Playback tab lists every output device Windows knows about. The default device is the one apps use unless they pick their own output.

If an external monitor without speakers is set as the default, you hear nothing. Microsoft calls this out as a common cause of silent HDMI setups.

1. Open the Sound window with control mmsys.cpl and stay on the Playback tab.
2. Right-click the speakers or headphones you want and choose the option that sets them as the default device.
3. To send calls to a headset while music stays on the speakers, right-click the headset and set it as the Default Communication Device.
4. To check a device is switched on, select it and select Properties. Next to Device usage, choose Use this device (enable).
5. On the Advanced tab of the same Properties window, change Default Format if audio is silent or distorted, select OK and test again.
6. On the Advanced tab, clear Enable audio enhancements under Signal Enhancements if the device sounds wrong, then select OK.
7. Select OK to close the Sound window and play a video or song to test.

This is also how you set the right speakers or headphones when Windows keeps switching to a monitor or a Bluetooth device. On Windows 11 the quick alternative is Settings > System > Sound: selecting a device under Output also makes it the default. To give one app its own device or volume, adjust volume for individual programs.

Configuring recording devices and microphones

The Recording tab mirrors the Playback tab for input devices. Chat and dictation apps use the default recording device unless you pick one inside the app.

1. Connect the microphone or headset, then open control mmsys.cpl and select the Recording tab.
2. Right-click the microphone you want and set it as the default device.
3. For calling apps, right-click the headset microphone and set it as the Default Communication Device.
4. Select the microphone and select Properties. Next to Device usage, make sure Use this device (enable) is chosen.
5. If a USB headset sounds processed or echoes, open the Advanced tab and clear Enable audio enhancements, then select OK.
6. Test the microphone on Windows 11 in Settings > System > Sound: under Input, select the microphone, select Start test, speak, then select Stop test and Play.
7. Adjust the Input volume slider on that same page if the recording is too quiet.

To adjust microphone levels and names, open the microphone’s Properties: the Levels tab sets the input level, and the name box on the General tab renames it, which helps when several identical USB microphones are listed.

Windows also blocks microphones through privacy settings. If apps still hear nothing, check Settings > Privacy & security > Microphone, covered in the troubleshooting section below.

Adjusting system sounds and communications settings

This is where you change Windows alert sounds. The Sounds tab holds the sound scheme, which Microsoft defines as a collection of sounds for common program events such as signing in or receiving new email. Programs that register their own events appear in the same list.

Only .wav files can be assigned to an event. Other formats such as .mp3 or .aac do not work.

1. Open control mmsys.cpl and select the Sounds tab, or search for Change system sounds from Start.
2. Under Program Events, select the event to change, for example New Mail Notification under Windows.
3. Open the Sounds drop-down and pick a different sound, or choose the no-sound entry at the very top of the list to silence that event.
4. To use your own file, select Browse and pick a .wav file.
5. Select OK to keep the change.
6. To change call behaviour, select the Communications tab.
7. Choose whether Windows lowers other sounds during a call (80% is the default reduction), mutes all other sounds, or does nothing, then select OK.

The Communications setting only applies to calls on the device chosen as the default communication device. When every call stream closes, Windows restores the volume of the sounds it lowered.

mmsys.cpl vs Windows 11 Sound settings

Settings handles everyday switching, but several jobs still exist only in mmsys.cpl. Use this table to go straight to the right window.

Job	Windows 11 Settings	Sound control panel (mmsys.cpl)
Set the default speakers	System > Sound > select a device under Output	Playback tab, right-click the device
Set the default microphone	System > Sound > Input > Choose a device for speaking or recording	Recording tab, right-click the device
Separate device for calls	Not available	Default Communication Device on the Playback and Recording tabs
Enable or disable a device	Device properties page	Properties > Device usage
Turn off audio enhancements	Device page > Advanced settings > Audio enhancements set to Off	Properties > Advanced > Enable audio enhancements
Change the output format	Not listed on Microsoft's steps	Properties > Advanced > Default Format
Change event sounds	Not available	Sounds tab > Program Events
Lower other audio during calls	Not available	Communications tab
Per-app volume	Volume mixer (ms-settings:apps-volume)	Not available
Open by command	ms-settings:sound	control mmsys.cpl

Test speakers and microphone after changing mmsys.cpl settings

1. Reopen control mmsys.cpl. On the Playback tab, the device you chose should be marked as the default device.
2. Play a video or song. Sound should come from that device without changing anything in the app.
3. For a microphone, open Settings > System > Sound, select it under Input, select Start test and speak. Stop test and Play should replay your voice.
4. For a system sound, trigger the event, such as a new email arriving. You should hear the new sound, or nothing if you silenced it.
5. For call behaviour, start a call on the communication device while music plays. The music should drop, mute or stay the same, matching your Communications choice.

Troubleshooting common audio problems with mmsys.cpl

These are the problems mmsys.cpl sound settings can fix in Windows: the wrong default device, a disabled device, enhancements or a format the hardware dislikes, and call ducking.

Start with Microsoft's automated check on Windows 11: Start > Settings > System > Troubleshoot > Other troubleshooters, then select Run next to Audio. Work through the symptom that matches yours if that does not fix it.

No sound, or sound plays from the wrong device

The wrong device is the default, or the device is muted or disabled.

1. Check cables and power, and unplug headphones in case they are taking over from the speakers.
2. Open control mmsys.cpl, and on the Playback tab set your speakers or headphones as the default device.
3. Select the device, select Properties, and set Device usage to Use this device (enable).
4. Select the Speakers icon on the taskbar and make sure the volume is up and not muted. Some speakers and apps also have their own volume controls.
5. If an external monitor without speakers was the default, choose a different output device.

The microphone does not appear in mmsys.cpl

Windows has not detected the device, usually because its driver is missing or not loading.

1. Reconnect the microphone, or try a different USB port. Pair a Bluetooth headset again if needed.
2. Right-click Start and select Device Manager, then expand Sound, video and game controllers.
3. Select View > Show hidden devices, then Action > Scan for hardware changes.
4. If the device is listed but disabled, right-click it and select Enable device.
5. If it is still missing, right-click the audio device, select Uninstall device, tick Attempt to remove the driver for this device, select Uninstall and restart. Windows reinstalls the driver on restart.

The microphone is listed but apps cannot hear you

Microphone privacy settings block access, or another microphone is the default.

1. Check the headset's own Mute button.
2. Select Start > Settings > Privacy & security > Microphone and turn on Microphone access.
3. Turn on Let apps access your microphone, then Let desktop apps access your microphone for desktop programs.
4. In control mmsys.cpl, set the microphone as the default device on the Recording tab.
5. Test it in Settings > System > Sound > Input with Start test.

No sound after a Windows update

An updated audio driver misbehaves, or an update is waiting for a restart.

1. Select Start > Power. If Update and restart appears, select it to finish pending updates.
2. Open Device Manager, expand Sound, video and game controllers, right-click the audio device and select Properties.
3. On the Driver tab, select Roll Back Driver and follow the prompts.
4. If roll back is unavailable, select Update driver > Browse my computer for drivers > Let me pick from a list of available drivers on my computer and choose High Definition Audio Device.
5. Reopen control mmsys.cpl and confirm the right device is still the default.

Audio is distorted, quiet or crackling

Audio enhancements or the output format do not suit the device.

1. In control mmsys.cpl, select the device on the Playback tab and select Properties.
2. On the Advanced tab, clear Enable audio enhancements and select OK.
3. Under Default Format, pick a different setting, select OK and test. Try another format if it does not help.
4. Restart the audio services: search for services, right-click Windows Audio and Windows Audio Endpoint Builder in turn, and select Restart.

Navigate by voice or understand blocked PCs

If you control the PC with Voice access, say “Open Run”, then dictate mmsys.cpl and say “Press Enter”. On a work or school PC, an administrator can hide Control Panel items through Group Policy; if mmsys.cpl reports that the operation was cancelled because of restrictions, ask your IT team instead of trying to bypass it.

If none of these work, install the latest audio driver from your PC or sound card maker's own support site.

mmsys.cpl FAQ

Is mmsys.cpl safe to run on Windows?

Yes. mmsys.cpl is the Windows Sound control panel module, listed in Microsoft's Control Panel reference at %SystemRoot%\System32\mmsys.cpl under the canonical name Microsoft.Sound. Opening it changes nothing on its own; settings change only when you confirm them with OK.

How do I open mmsys.cpl from Run or Command Prompt?

Press Windows key + R, type control mmsys.cpl and press Enter. The same command works in Command Prompt, PowerShell and Windows Terminal. You can also run control /name Microsoft.Sound, which uses the canonical name from Microsoft's Control Panel reference.

How do I set my headphones or speakers as the default playback device?

Open control mmsys.cpl, right-click the headphones or speakers on the Playback tab and set them as the default device. On Windows 11 you can also go to Settings > System > Sound and select the device under Output, which sets it as the default.

What should I do if my microphone does not appear in mmsys.cpl?

Reconnect it, then open Device Manager, select View > Show hidden devices and Action > Scan for hardware changes. Enable the device if it is disabled. If it is still missing, uninstall the audio device with its driver and restart so Windows reinstalls it.

Can mmsys.cpl fix no sound after a Windows update?

Partly. mmsys.cpl confirms the right device is the default and enabled. If the update changed the audio driver, the fix is in Device Manager: open the audio device's Properties, select the Driver tab and choose Roll Back Driver, then restart.

Where is the Sound control panel in Windows 11?

Open Start > Settings > System > Sound, scroll to Advanced and select More sound settings. That link opens the same Sound window as control mmsys.cpl, with the Playback, Recording, Sounds and Communications tabs.

Why does Windows lower my music during calls?

The Communications tab in mmsys.cpl tells Windows to reduce other sounds by 80% by default when a call uses the communication device. Change it to mute other sounds or to do nothing, then select OK. Windows restores the volume when the call ends.

Can I open mmsys.cpl straight to the Recording tab?

Yes. Run control mmsys.cpl,,1 from the Run box or a terminal to open the Sound window on the Recording tab. Use ,,2 for the Sounds tab and ,,3 for Communications.

How do I turn off a Windows notification sound?

Open control mmsys.cpl and select the Sounds tab. Select the event under Program Events, open the Sounds drop-down and choose the no-sound entry at the very top of the list, then select OK. That event then plays no sound.