This is the demo version of Gnaural for Android. This is strictly the demo version of Gnaural for Android, intended to give people a means to verify that it will run on their device before purchasing it. However, it does have one built-in preset (a basic meditation schedule), which may be all many people need. The full version of Gnaural for Android comes with 14 built-in presets and the ability to play external presets created on the computer-based Gnaural. For more information on Gnaural for Android, see its page here:https://market.android.com/details?id=org.gnaural Gnaural for Android is a true sound synthesizer, creating and mixing CD quality sound without relying on sound files. Generating synthesized sound requires a lot of processing power. To avoid audio stuttering, it is recommended that the phone be a recent model running at least Froyo (2.2). However, there are options to lower the processing load by either lower the sample rate (under Preferences) or turning off extra voices.