Audio Function Generator PRO is a highly recommended and praised tone generator app for iPhone, designed for simplicity and enriched with a vast amount of features. This multimedia app is developed by Thomas Gruber and is available as a full version.

This amazing app allows you to play test tones, frequency sweep test tones, volume sweeps, and music tone playback. You can also experiment with the huge fine-tune selection, presets selection, and create your own custom presets. The app also allows you to save an endless amount of configurations for later quick access and direct playback function.

In addition, this app supports different kinds of noise such as white, pink, violet, grey, brown, and blue. The advanced settings and features include extending the frequency range, sweep times, and changing signal amplitude. You can also enable the sweep repeat/wobble function, select frequency slider setting to linear or logarithmic, left/right channel individual selection, and permanently save custom presets.

The app also includes a phase-out setting, BPM (Beats per Minute) feature, dual function generator, multitone generator, and background theme selection (light/dark). The Function Generator is amazingly intuitive and simple, making it an excellent choice for anyone looking for a powerful tone generator app.