Thanks for being a good sport. The HN crowd can be quite rough. Don't take it personally. I'd take feedback from non-technical users more seriously as they don't have a tendency toward know-it-all-ism and contrarianism like the HN crowd does (myself included I suppose).

To refute the parent, the problem exists. I have a keyword sans playback buttons. I've often wanted a quick way to pause music. Even on my Mac where there are playback buttons, sometimes ill be listening to Spotify, try to pause the song using the keyboard, then iTunes tries to open instead. I'm not sure if your app addresses that problem but it'd be cool if it did.