Gnaural is an audio synthesizer designed for meditation and relaxation, offering binaural beats, isochronic tones, pink noise, and various nature sounds like rain and ocean waves. Available for Mac, Windows, and Linux, Gnaural allows users to create and play customizable meditation sessions. On Android, Gnaural can play presets with options to control voices, loops, and schedule navigation. Users can edit presets in XML format manually, though external audio files are limited to CD-quality WAV. The app includes 14 built-in presets for mental exploration and relaxation, generating CD quality sound without relying on pre-recorded files. Users can adjust settings for smoother performance on older devices. The free version is available on the Android market.