Oscillator vs ToneGen PlusMinus

Oscillator is a simple and rough audio generator application which has the following functions. You can use it as a test tone and play it as a strange musical instrument. - Four waveforms. (i.e. sine wave, square wave, saw wave and white noise.) - Exponential Frequency control using the slider. - Frequency numeric input using the software keyboard. - Equal distance panning control using the slider. - dB style amplitude control using the slider. - Sound output on/off button. - All sliders and buttons are multi-touch controlled. Please note the limitations below before you purchase/use this application. - The frequency control is not effective with the white noise oscillator. - The panning control is not effective with an iPhone internal speaker because it is monophonic. Use headphones or stereo speakers. - The audio output might be interrupted on a keyboard input, a view change and so on. - The accuracy of the audio output is not very high but it is reasonable.

Signal generator for identifying audio frequencies by manually matching the pitch. Identifying feedback frequencies rapidly and precisely as an audio tech in a concert situation is a crucial function. Sometimes the feedback is intermittent, or only happens for an instant. For decades I and others have used the procedure of holding a heard pitch in my head and them matching it with some sort of tone generator. There are several iPhone apps that I have used, holding the phone up to my ear to hear the tone. They all have either a dial or a slider to set the pitch. An endless dial can be very precise, but is difficult to operate without looking at the screen. A slider is resolution limited by the length on the screen and so can't be precise. ToneGen PlusMinus uses a novel pitch setting UI which I invented 20 years ago for a Palm III app I wrote. It is very easy to rapidly and precisely match a frequency across it's range of 30 Hz to 10 kHz, without looking at the screen at all. The farther up or down from center your touch slides, the faster the pitch changes. Slide back to center and it stays stable.