If you install macOS on an additional volume of your startup disk, you can switch between that macOS and the macOS on your other volume, as if each were on a separate disk. And because storage space is shared across APFS volumes, you don't need to reserve space for the new volume. Its size automatically adjusts to fit your content.
What you need
For the past several versions of Windows you can double-click on the speaker icon in the lower-right corner of your display and click on the Mixer link to assign volume levels for each of your. Point of sale software for mac reviews. Mar 10, 2016 The only exception to this is the System Sounds volume. Since it’s always running, it will stay how you set it until you restart your computer, at which point it will match itself to 100% of the master volume. Only desktop apps will appear in the Volume Mixer. You can’t adjust volume individually for universal apps. How to lower the volume of your Mac's startup chime. You can adjust the volume level of the sound you hear when your Mac starts up without affecting the volume of your external speakers or headphones. Output volume defines the maximum volume that sound-playing applications can emit, so if you set Output volume at 75 percent and then play a song in iTunes with the iTunes volume at 50 percent, the song plays at 37.5 percent of the Mac’s maximum output capacity. (Optional) Select (or deselect) the Show Volume in Menu Bar check box.
Your Mac must already be using macOS High Sierra or later on an APFS-formatted startup disk. Find out which format your startup disk is using.
You don't need to reserve storage space for the new volume, but macOS needs as much as 20GB of available space to install, depending on the version of macOS. If you don't have enough space, the installer will let you know.
About This Mac includes a storage overview: Choose Apple () menu > About This Mac, then click Storage.
Back up your Mac
It's a good idea to back up your Mac first, especially if you're installing a beta version of macOS. Beta software is software that is still in development, so some apps and services might not work as expected.
Add an APFS volume
- Open Disk Utility, which is in the Utilities folder of your Applications folder.
- In the sidebar, select your existing APFS volume.
- Choose Edit > Add APFS Volume from the menu bar, or click in the Disk Utility toolbar. These options are available only when an APFS volume is selected.
- Type any name for the new APFS volume, then click Add:
- Disk Utility should now show the new volume in the sidebar. The new volume will also appear in the Finder, as if it were a separate disk. You can now quit Disk Utility.
Install macOS on the volume
Choose an installation method:
- To install a beta (prerelease) version of macOS, enroll in the Apple Beta Software Program and follow the installation instructions on the program website.
- To install a release version of macOS, you can use macOS Recovery. The keys you press at startup determine which macOS is installed.
Lower The Volume On Specific Apps Mac Free
When the installer opens and you're asked to choose where to install, click Show All Disks, then select the new volume.
Switch between macOS versions
After installation is complete, you can use Startup Disk preferences or Startup Manager to quickly switch between each macOS:
- Choose Apple () menu > Startup Disk, then click and enter your administrator password. Select the volume that you want to use, then click Restart.
- Or press and hold the Option key during startup. When prompted, choose the volume that you want to start up from.
Keep the macOS on each volume up to date
To find the latest updates for each version of macOS, check for software updates, then start up from the other volume and check for software updates again.
Learn more
If your Mac is using macOS Sierra or earlier, or the startup disk is formatted as Mac OS Extended instead of APFS, you can create a new partition instead. The space it occupies doesn't automatically adjust to fit your content, so you must manually size the partition. Learn how to add a volume to a device formatted as Mac OS Extended.
Every Mac can play sound through speakers (built-in or external) or headphones, from making the simplest beeping noise to playing audio CDs like a stereo. Three primary ways to modify the sound on your Mac involve volume, balance, and input/output devices.
Volume: Simply means how loud your Mac plays sound by default. Many applications, such as iTunes, also let you adjust the volume, so you can set the default system volume and then adjust the volume within each application, relative to the system volume, as well.
Balance: Defines how sound plays through the right and left stereo speakers. By adjusting the balance, you can make sound louder coming from one speaker and weaker coming from the other.
Input/output: Depending on your equipment, you might have multiple input and output devices — speakers and headphones as two distinct output devices, for example. By defining which input and output device to use, you can define which one to use by default.
To modify the way your Mac accepts and plays sound, follow these steps:
Choose Command→System Preferences and click the Sound icon.
Or, Control-click the System Preferences icon on the Dock and choose Sound from the menu that opens. The Sound preferences pane appears, as shown.
Choose a sound effect.
Click the Sound Effects tab (if it isn’t already selected) and scroll through the list to choose the sound your Mac will play when it needs your attention, such as when you’re quitting an application without saving a document.
(Optional) From the Play Sound Effects Through pop-up menu, choose whether your Mac plays sounds through its built-in Internal Speakers or through another set of speakers you might have connected to your Mac.
(Optional) Drag the Alert Volume slider to the desired location to set how loudly (or softly) your Mac will play the alert when it needs to get your attention.
(Optional) Select (or deselect) either of the following check boxes:
Play User Interface Sound Effects: Lets you hear such sounds as the crinkling of paper when you empty the Trash or a whooshing sound if you remove an icon from the Dock.
Play Feedback When Volume Is Changed: Beeps to match the sound level while you increase or decrease the volume.
(Optional) Drag the Output Volume slider or press the volume-up and volume-down keys on the keyboard.
Output volume defines the maximum volume that sound-playing applications can emit, so if you set Output volume at 75 percent and then play a song in iTunes with the iTunes volume at 50 percent, the song plays at 37.5 percent of the Mac’s maximum output capacity.
(Optional) Select (or deselect) the Show Volume in Menu Bar check box.
When selected, you can see and adjust your Mac’s volume from the menulet in the menu bar.
Menulets are mini menus that open when you click the icons on the right end of the menu bar and give you quick access to specific System Preferences settings, such as Network, Time and Date, or Sound.
Click the Output tab to display the Output preferences pane.
Click the output device you want to use if you have another output option connected to your Mac, such as headphones or external speakers.
Drag the Balance slider to adjust the balance.
Click the Input tab to open the Input preferences pane, as shown in the figure.
Click the input device you want your Mac to use to receive sound.
For instance, you might choose a built-in microphone or the line in port as your input device.
Your Mac may not have a Line In port — the MacBook Air does not.
Drag the Input Volume slider to adjust the default input volume.
Select (or deselect) the Use Ambient Noise Reduction check box to eliminate background noise.
Select this option if you’re recording with the built-in microphone or someone you’re having a FaceTime or Messages voice or video chat with complains that they can’t hear you clearly.
Click the Close button to close the Sound preferences pane when you finish making adjustments.
Input preferences let you define how to record sound.