zenAud.io ALK currently requires the latest version OSX - MacOS Sierra.. In addition, ALK makes use of your computer's GPU (Graphics Processing Unit) in order to deliver buttery smooth graphics full of neon/transparency goodness, all while leaving your CPU minimally taxed.
To achieve that, we use Apple's awesome new Metal API. Unfortunately, this means that zenAud.io requires a Mac more recent than 2012. How can you tell if your Mac is new enough to run ALK? Simple: choose "About This Mac" from the Apple menu () in the upper-left corner of your screen to find out if your mac supports zenAud.io.
If there are enough users having difficulty with either of these two requirements, we can can work on loosening them. So please shout if the Sierra and GPU requirements are a problem for you!