As of August 1st, 2013, the free version of Gnaural for Android is no longer a feature-disabled demo, it has all the functionality of the pay version, just perhaps not updated as frequently. The decision was made to give it away because the primary goal of Gnaural, throughout my 15 years of developing it and it's precursors, has always been to get everyone meditating. Two years ago, it took some incentive to spend the months required to write from scratch the Android code capable of playing Gnaural presets, because dealing with audio, GUIs, and XML in Java was entirely foreign to how I'd written Gnaural's C code. While charging for it never did exactly compensate in the way I'd hoped, I am thankful it at least got me to undertake the tedious endeavour (which also got me to invent two brand new Voices that then made their way in to Gnaural - Water and Rain!). And I am also dearly thankful for all those who did spend the cost of a cup-of-coffee to help support it. But the kind words are worth even more. From now on, it is hoped that that people who genuinely love Gnaural will voluntarily elect to support it by purchasing the pay version. But of course, that is absolutely voluntary. Enjoy Gnaural!