Simplify UI

[tronta]

First of all, thank you for your program. It's fun using it.
I personally would suggest to make the UI simpler, as I assume it's only used for controlling background sounds.

What about having only a volume control at the bottom?
When tapping on the loudspeaker (left bottom) it will be muted (paused). Tapping again on the loudspeaker, the sounds will be played again with the original loudness.
The options in the bottom's menu could be move to the upper menu.

[MMachado05]

I think I agree with this, though I would personally prefer including the white circle to know "exactly" where the sound is set. I find adjusting a bar without this circle very unnatural.

Perhaps then the "add new sound" button could be sent to the top left, and to the right of the volume bar you've drawn, a "save as new preset" button could be added? Then we remove the need for the second menu currently to the right of the pause/play button altogether!