Great job, but I would like to inspire a thought: Maybe combining the symbols for volume and microphone on the left with the switches on the right? I mean, using the symbols as the switches themselves. Would be even more minimal.
it's very clean and easy to understand. Keep up the good work! Right now i have 2 music players on my desktop, Noise and Spotify. I'd really like to see that you can only adjust the one that is playing. (now both spotify and noise are visible, wich is sort of annoying).