Tone Generator Ultra is a simple and easy-to-use test tone and frequency generator. Tones can be set by frequency or musical note. Features: -Sine, Square & Sawtooth Wave Generation -Chromatic pitch detection from external sources -Configurable A4 callibration -White and pink noise -Multi-tone generator -Impulse wave -Supports frequencies from 20Hz to 22kHz -Logarithmic / linear sweep utility with adjustable upper and lower frequencies and delay Tone Generators are very useful for a variety of tasks including: - Balancing your Stereo or Home Cinema System - Testing Speakers - Acoustics testing - White and Pink Noise Generator Can be used inconjunction with PocketRTA Ultra Spectrum Analyzer for the iPhone. Or for fun - Compare your friends hearing, see who is straining to hear the sounds - Annoy your best friend with that pesky sound. - But definately not to be used to annoy your teachers.