>then a menu of sounds
I really wouldn't change the layout to anything menu like. Its got the clean & simple thing going for it. Maybe rather add a button that opens "advanced" options i.e. more sliders coming into view - white noise etc. Seems a bit artificial but it gives you a way to split off less popular and weird stuff like artificial white noise. Plus delayed loading of those sounds. Adding a drop down or similar would kill the clean layout in my view.
Since you reacted positively to the initial feedback:
- The share mix button at the top looks wildly out of place. Its outside of the main rectangle and looks weird as a result.
-I'm allergic to the word "share" tbh...consider replacing it with "publish"/"broadcast" or similar. Sounds a bit presumptuous...but "share" has become a seriously craptastic word online - even erotic sites have a "share on facebook" button. If you must have it rather move it as far down as possible - so that users can first toy with the sliders a bit & get a feel for things before being asked to vouch for it to friends.
- The colour scheme (stark black white) is not conducive to the tranquil vibe you're trying to convey. Best bet is adding some colour hint to it I think. Keep the basic idea, but add some faint highlight colour(s). Think earthy warm colours.
- The humans track is way too loud. If you set all the sliders to mid then all you hear is humans. Either lower it as a whole or dampen the 600hz-700hz frequency range gently (assuming my ears aren't failing me on that freq guestimate).
>I've had a hard time finding good audio that has the right feel
Yeah. Wind is a bit of a biatch in this regard since most microphones are engineered to specifically block wind noises. And those that aren't distort wind sounds like mad. Maybe something like this (bit short):
https://www.youtube.com/watch?v=__O0RRiWcpk