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From Ken Schutte:
ToneExplorerToneExplorer lets you generate, view, hear, and easily manipulate basic audio signals using natural touch gestures.- This is a UNIVERAL APP: one purchase works on both iPhone (iPod touch) and iPad.The iPad interface is designed specifically the the iPad screen size.==== Offers a very flexible tone generator ====- Four waveform shapes to listen to / view: - Sinusoidal - Saw-tooth - Triangular - Square wave- Enter aritrary values for frequency and amplitude.==== Unique graphical/interactive interface to set paramegers ==== 1. Waveform View:The time-domain representation of the signal, and change the frequency or amplitude by simply pinching and stretching the waveform. 2. Parameter View:A "phase-space" view of the waveform's parameters:frequency and amplitude. Control these two parametersby moving a point in the frequency-amplitude plane.Dragging finger can mimic theremin-like sounds.Change units:- Ampltiude: linear or logarithmic (dB, decibels) scale.- Frequency: linear (Hertz) or logarithmic (midi note number) scale.- Zoom in/out Both views can be zoomed in and out. Can make aritrarily fine-grained changes to the parameters. - A variety of other methods to set the frequency: - Set to the frequency corresponding to a musical note.Choose from presets of all notes spanning 11 octaves. - Change frequency by musical intervals: - Minor second - Major second - Minor third - Major third - Perfect fourth - Tritone - Perfect fifth - Minor sixth - Major sixth - Minor seventh - Major seventh - Octave - Set to frequency corresponding to notes on typical instruments. Presets include: - Guitar- Violin- Viola- Cello- Bass- Piano ==== More uses ====- Check your hearing. Find the maximum frequency/amplitude setting you can hear.- Educational. Learn and explore the concepts of amplitude, frequency, wavelength, pitch, and volume. Also explore the differences between linear and logarithmic scales for frequency and amplitude.- Musical ear training. - Generate high-pitched tones: control dogs (dog whistle), irritate young people, and confuse old people.- Tune instruments. Includes settings for guiar,violin,viola,cello,bass, and piano.