LOVE the app. Used to run it a lot then dropped it once it became a CPU hog. Quite some time later I figured the issues had been resolved. On 10.10.2 at least they still persist, alas, pinging a top of the line MacBook Pro 15 with 95% CPU usage after running for roughly an hour (not sure when the CPU usage spiked, but sometime within the hour).
A shame. Otherwise this is a simple, fluid app that does exactly what it says it does. Small selection of modes, yes, but they are solid and enjoyable. I guess I will check back in another 6 months hoping they have finally fixed this bug.
Shade of Grey about Elsewhere: Ambient Nature Sounds