If you've used iTunes or the App Store within the past few years, Ambiance will look immediately familiar. On the left you'll find links to your library of sounds plus the Ambiance store. Beneath that you'll find your playlists and mixes. The main content area is on the right. Choose between list or grid view, and sort by name, date, category or rating.
To play a track in your library, simply mouse over it and press the triangle. An image depicting the current sound appears in the lower left (similar to the album art in iTunes) along with that sound's rating, description and location (on a playlist, general library item, etc.). You can also play and pause from the image on the left.
The top of the window again borrows from iTunes and offers standard playback controls, volume and repeat/shuffle buttons. What's really nice is the timer. Those using Ambiance to fall asleep will want to have the sound stop playing after a given amount of time. You can even opt to have the volume slowly fade to nothing over a period of minutes, so as not to jar you awake with an abrupt halt.
Click the gear icon in the lower right-hand corner to reveal the Settings window. Here you'll find Timer and Cycle (or "repeat") functions. As I said, the timer option is very nice. The duration can range from anytime between a minute and 24 hours. When that's through, you can opt to have an alarm sound (12 alarm sounds are available).
Beneath the Advanced disclosure triangle you'll find options to fade your sound in or out over time, and even quit the app once the sound has faded out. Again, that's a super option for those looking to conk out.
Finally, Cycle settings let you loop a sound over and over. What's really nice about the Settings window is that the help buttons (marked with a "?") pop up an image of the button in question. That's much tidier than a text explanation and just as effective.
What use is a clean UI if the app performs poorly, right? Fortunately, Ambiance for the Mac is a worthy companion to its iOS counterpart. There's a huge library of sounds in the store, each very high quality. Even the accompanying photos look good. Previews are available for each, and it's all sorted by category. My only complaint is that the sub-category windows are a bit small. For example, click the Industrial category (my favorite) and three subcategories are presented: What's New, What's Hot and Top Rated. Each shows only two sounds at a time. I'd like to have a list view option here, mostly because I'm impatient.
I should also comment on playlists and mixes. As with the iOS apps, Ambiance for the Desktop lets you create a playlist of sounds, say "Going to Sleep" or "Getting Ready for the Game." Additionally, mixes let you combine two or more sounds into one. For instance, if you like "Dryer A" but feel it could use a little beefing up from "Dryer B," combine then into The Ultimate Dryer!
Not everyone needs an ambient sound effects app for their Mac, but those who do will enjoy Ambiance. It's simple UI, wealth of high-quality sounds and useful options make it fun to use. Check it out and have fun!