SoundSource is a Mac utility that provides you with a quick and simple way to adjust sound volume and change the current audio input and output devices. The application lives on your Menu Bar from where you can make the necessary audio settings changes and access the integrated help manual.
All you need to do is to click its Menu Bar icon, make the necessary changes, and the utility will take care of the rest. The program uses minimum CPU resources while sitting on your Menu Bar, features easy-to-configure settings, and provides you with all the help you need while changing the audio options on your Mac.
Another good thing is that you can test the new audio changes by using the built-in Play-Thru tool.
This program comes as an alternative to heading to Mac's System Preferences and configuring the audio settings according to your needs. However, an aspect that not many macOS users might be aware of is that there's another simple way to access audio system settings. Move your mouse cursor over the sound volume icon from your Menu Bar and click the icon while holding down the Command key. A menu will be revealed from where you can change the input and output devices. Still, this menu doesn't bring you options for adjusting sound volumes.
In conclusion, it's up to you to decide if it's worth buying this utility for your Mac. Personally, I prefer using Mac's default solutions for adjusting sound volumes and changing the audio input and output devices.