Audio Kit for iPhone

Audio Kit is a new audio monitoring and testing app. Here's the description:

Audio Kit is a collection of four applications which are essential for those working in audio and sound. A real time Spectrum Analyser, a Scope to display waveforms, an SPL (sound pressure level) Meter, and a sine wave Signal Generator.

-View a real time spectrum of audio with the Spectrum Analyser
-View the actual waveform of the audio signal with the Scope
-An SPL Meter provides measurement of sound levels using an A-weighting
-The Signal Generator provides a sine wave output up to 20,000Hz in 1 Hz steps.

FFT (Fast Fourier Transform) is used to calculate the frequencies in the Spectrum Analyser and these are displayed in real time. The frequency is displayed in either logarithmic or linear scale.

The display of the Scope can be adjusted easily using pinch gestures in both horizontal and vertical directions. Zero crossing detection of the waveform provides a smooth display and can be set to either positive or negative direction zero crossing.

There is a screen capture facility in both the Spectrum Analyser and the Scope allowing you to save the spectra and waveforms for future reference.

SPL Meter continuously displays the sound pressure level, and has minimum and maximum displays also.

The output of the Signal Generator can be viewed on the other parts of the App.
Frequency is selected using picker wheels and allows for accurate control of frequency to within 1Hz. Volume is continuously adjustable, and there is a switch to quickly turn off volume and quickly reset it to the previously set volume.

All parts of the App have direct access to a help document.

Audio Kit at the app store