Audio Signal Generator is a powerful app designed for iPhone that allows users to generate various audio test tones. Developed by Media Punk Studios LLC, this utility falls under the category of Utilities & Tools and is available for free.

The basic version of the app includes a sine wave generator, capable of producing signals ranging from 20 Hz to 20 kHz, with a sample rate of 48 kHz and 16-bit samples. With a wide dynamic range of 96 dB, users can precisely control the frequency using a logarithmic knob or keyboard input.

For advanced users, the Pro Tone Generator offers additional features through an optional in-app purchase. It extends the frequency range down to 1 Hz, adds stereo control, and provides buttons to increment the frequency in steps. The Pro Tone Generator also introduces anti-aliased square waves, sawtooth waves, and triangle waves with minimal aliasing.

In addition to tone generation, the app offers a Noise Generator as another optional in-app purchase. Users can generate white noise, pink noise, and brown noise. Pink noise falls off at a rate of 3 dB per octave, while brown noise falls off at 6 dB per octave. Users can choose between stereo uncorrelated noise or mono correlated noise.

Furthermore, the Frequency Sweeps feature, available as an optional in-app purchase, allows users to generate adjustable start and stop frequencies for linear or logarithmic sine wave frequency sweeps. Users can choose from single-shot sweeps, repeating upward sweeps, and upward/downward sweeps.

Audio Signal Generator proves to be a versatile tool with various applications. It can be used to test speakers and headphones, balance home theater systems, tune car audio systems, mask environmental noise, burn in headphones, and tune musical instruments. With its user-friendly interface and extensive features, this app is a valuable addition for audio enthusiasts and professionals alike.