SoundSource is a mac only audio application that gives you complete control over your audio.
I’ve been using it for a day now and I love it. This app is absolutely worth the money.
To change audio devices before I had SoundSource I used to hit cmd-spacebar to bring up spotlight, then type sound and open the controls, then adjust my audio input/output from there.
Now all my audio controls are in the top menu. I have quick control over my input/output and sound fx devices and levels, including levels for every application. I can direct any application audio to any device, for example I can playback adobe audition through my headphones and spotify through my speakers. It even lets you control the sample rate of your output.
One of the coolest things is you can apply effects to your output. It comes with a 10 band equalizer, fader and boost but it will also apply any AU effect that you have installed on your machine.
Here’s a screenshot from my machine:

Another great feature is the ability to show input and output levels in your menu bar. And the option for dark mode.
As you can see from the below screenshot, it’s using 277mb of memory which is pretty light compared to the 600+mb dropbox and creative cloud use while idle.

After having this app for a day there’s absolutely no going back.