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If you don't have working sound in Linux(quite common) and your in the multimedia configuration running the test you can see the button depressed while the test sound is playing, which can really look like the button is stuck if your not hearing anything. I suggest making it more clear that a test sound is playing possibly by:

- Making the test button's text change to stop and the icon to a stop icon
- Showing a small progress bar somewhere to indicate that the sound is playing possibly with a label saying that the sound is indeed playing.