# Audio Function Generator PRO — Frequency and Signal Generator

> Generate and manipulate audio test tones, sweeps, and noise with advanced customization. (iPhone/iPad app by Thomas Gruber.)

- Source: https://appshunter.io/ios/app/audio-function-generator-pro/id895074703 (this page in markdown: same URL + `.md`)
- Developer: [Thomas Gruber](https://appshunter.io/developer/342699861)
- Category: Music, Utilities
- Price: $12.99
- Rating: 4.80/5 from 266 App Store ratings · 58 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.5 · 13 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2014-07-15
- Data updated: 2026-08-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews.md

## What is Audio Function Generator PRO?

This is the highly recommended and praised Function Generator App - an amazingly great and powerful tone generator. Enriched with a vast amount of features yet it is extremely intuitive and designed for simplicity.

Get to know this great App now! It is very well maintained and has received considerable upgrades over the past years.

So, … what can you do with this App?

• PLAY TEST TONES Sine, Rectangular, Triangular and Sawtooth.

• PLAY FREQUENCY SWEEP TEST TONES in both directions (minimum to maximum frequency and maximum to minimum frequency). 

• PLAY VOLUME SWEEPS (from minimum to maximum volume).

• Try the SWEEP REPEAT / WOBBLE function.

• Try the MUSIC TONES PLAYBACK.

• Experiment with the huge FINE TUNE SELECTON, PRESETS SELECTION!

• Or create your own CUSTOM PRESETS!

• And SAVE an endless amount of CONFIGURATIONS (Frequency, Sweep, Noise) for later quick access and direct playback function.

• Even play back different kinds of NOISE – White, Pink, Violet, Grey, Brown, Blue is also supported.

The Function Generator is AMAZINGLY INTUITIVE and SIMPLE!


AND THESE ARE THE ADVANCED SETTINGS/FEATURES:
=> Extending The Frequency Range (1Hz - 21kHz)
=> Extending The Sweep Times (0.1s - 600s)
=> Changing Min/Max Slider Frequency Ranges 
=> Changing Max Sweep Time Slider Range
=> Changing Signal Amplitude
=> Enabling Of The Sweep Repeat / Wobble Function
=> Frequency Slider Setting to Linear or Logarithmic
=> Left/Right Channel Individual Selection
=> Permanently Saving Custom Presets
=> Saving Of Endless Number Of Audio Configurations
=> Phase Out Setting (custom phase shift of the generated signal)
=> BPM (Beats per Minute) Feature
=> Dual Function Generator
=> MultiTone Generator (playback of up to eight individual tones)
=> Background Theme Selection (Light/Dark)

Check out the new Tutorial page: www.ee-toolkit.com/audio-function-generator

## Key features

- Generate sine, square, triangular, and sawtooth tones
- Frequency and volume sweep generation
- Customizable presets and configurations
- Multiple noise types (White, Pink, Violet, etc.)
- Advanced signal parameter control
- Multi-tone and dual function generation

## What do users think of Audio Function Generator PRO?

Overall sentiment: positive

**Pros**

- ✨ Superb craftsmanship and work
- 🚀 Excellent performance on older devices
- 💡 History feature is a great addition
- 👍 Versatile and powerful app
- 🎶 Great for binaural beats and sound creation
- 🔧 Customizable presets and modulation
- 🎧 Useful for tinnitus relief
- 🔊 Great for audio testing and tuning
- 💡 Elegant and sophisticated interface
- 💰 Best value for money
- 🛠️ Excellent support
- 🎛️ Detailed sound wave control
- 🎯 Accurate and easy to use
- 🔊 Good for speaker testing
- 🎶 Useful for sleep entrainment
- 🎹 Perfect for speaker building
- 💡 Well-thought-out and implemented
- 💯 Top frequency generator
- ✅ All functions present
- 🎚️ Bargain price, highly recommended
- 🎶 Excellent for piano tuning
- 👂 Useful for hearing checks
- 🔬 Great for electronics lab
- 💾 Parameter saving is great
- 🚀 Sweep function is great
- ⚙️ Practical tool, not overwhelmed with graphics
- 🔊 Accurate and functional
- 🎵 Easy to use, perfect for speakers
- 🌟 Best in class
- 🚀 Excellent application
- 💡 Electronic tuning fork
- ✅ Good multiple use app
- 👍 Great as a function generator in the electronics lab
- 💯 Excellent tone generator
- ✨ Super top
- 👍 Great app
- 🚀 Great app
- 🎶 Great app
- 👍 Great app

**Cons**

- 📉 Linear sweep is useless
- ❓ Missing PWM functionality
- ❓ Missing Terzrauschen (third-octave noise)
- 🐛 Volume button issues
- 🐛 GUI is bad
- 🐛 Buttons don't respond
- 🐛 Settings don't keep
- 🐛 Frequencies stick
- 🐛 App stops too much
- 📉 Frequency range not enough
- 🐛 Update crashes on iPad Air2
- 🐛 App opens AppStore repeatedly after purchase

**Commonly reported bugs**

- Volume button issues (jumps up and down, displays wrong level)
- Update crashes on iPad Air2 when changing screens
- App opens AppStore repeatedly after purchase
- Buttons don't respond, settings don't keep
- Frequencies stick, program is useless
- App stops too much

**Most requested features**

- Logarithmic sweeps and frequency slider scale
- PWM functionality
- Terzrauschen (third-octave noise)
- Ping-pong sweeps in Multitone windows
- Sweeping of noise/adding noise in Multitone sweep with sweeping bandpass filter
- Audio plugin (AU, AAX, VST)
- Responsiveness for MacBook use
- Simultaneous recording of generated signals
- Panning function for tones and sweeps
- Ability to save Multitone configurations
- Phase shift functionality
- Higher frequency range (up to 24kHz)
- Dual mode sweep function
- Taper function
- Extended time for sweeps (6-8 hours)
- Ability to stay at selected frequency for several minutes
- Spectrum analyzer
- Separate control for left and right channels
- 8-hour program for sleep entrainment

## Recent user reviews (10 of 58)

All indexed reviews: https://appshunter.io/ios/app/audio-function-generator-pro/id895074703/reviews.md

### 5/5 — a true masterpiece

*2025-02-03, version 8.2.0*

[Update] __ A great App just got a little better !
The History feature is icing on the cake.
.
.
I tried the free version, and within minutes purchased PRO … This App is a superb piece of work and works beautifully on my ageing 9.7” iPad Pro. Many thanks to the developer for his craftsmanship!

### 5/5 — Engineer

*2025-02-02, version 8.2.0*

Continues to become greater

### 5/5 — Pro

*2025-01-07, version 8.1.0*

5/5

### 5/5 — a true masterpiece

*2024-10-23*

I tried the free version, and within minutes purchased PRO … This App is a superb piece of work and works beautifully on my ageing 9.7” iPad Pro. Many thanks to the developer for his craftsmanship!

### 4/5 — Good app!!

*2024-08-14, version 7.5.0*

Good app

### 5/5 — amazing app

*2024-07-10, version 7.5.0*

elegant and sophisticated 😎

### 5/5 — FOR THE GODS

*2024-05-29, version 7.5.0*

We can use Function Generator Pro with Function Generator Free to play 2 frequencies at the same time with BPM. Best for Binaural Beats. We can Create the Sound we Want. MOST VALUABLE APP OF THE APPLE STORE PLUS CHEAP COST ! A MUST GET !!

### 5/5 — Versatile

*2023-12-06, version 7.3.3*

I’d been using the basics but recently needed something pretty weird.  The 48 customizable presets and the BPM modulation feature allowed me to achieve what I needed.  A GREAT app.  Thank you!

### 2/5 — Too linear.

*2023-03-20, version 7.1.0*

If you want more stars please explain how to get logarithmic sweeps and logarithmic scale for the frequency slider. 
A linear sweep is pretty useless in the audio world.

### 5/5 — So good!

*2023-03-10, version 7.0.1*

This app is a fantastic helper! 
Great interface and fast responses with technical questions.

## Frequently asked questions about Audio Function Generator PRO

### What does the Audio Function Generator PRO app do?

This app functions as a powerful tone and signal generator. It allows users to create and play various audio test tones like sine, rectangular, triangular, and sawtooth waves. You can also generate frequency and volume sweeps, experiment with different noise types, and save custom configurations for quick playback.

### What are the key features of this function generator app?

Key features include the ability to play standard test tones, perform frequency and volume sweeps, and utilize a sweep repeat/wobble function. It also offers music tone playback, fine-tuning selections, custom preset creation, and the generation of various noise types like white, pink, and brown noise. Advanced settings further enhance control over frequency range, sweep times, amplitude, and phase.

### Is this app free to use?

Yes, the application is available for free. Based on the provided information, there are no in-app purchases or advertisements, indicating a completely free user experience.

### What kind of audio signals can I generate with this app?

You can generate a wide range of audio signals, including basic test tones such as sine, rectangular, triangular, and sawtooth waves. Additionally, the app supports generating frequency sweeps (both ascending and descending), volume sweeps, and various types of noise including White, Pink, Violet, Grey, Brown, and Blue noise.

### Who would benefit from using this audio function generator?

This app is ideal for audio professionals, sound engineers, musicians, electronics hobbyists, and anyone involved in audio testing, calibration, or sound design. Its intuitive interface and extensive features make it useful for tasks ranging from basic tone generation to complex signal analysis and experimentation.

## Version history (last 5 releases)

### 9.2.0 — 2026-05-30

Smaller fixes and improvements

### 9.1.0 — 2026-02-28

Fantastic news for all the Sweep fans! The new version of the App introduces an enhanced AudioEngine that supports advanced Sweep options. An additional menu has been added to the Sweep Tab for a combined Volume+Frequency Sweep combination.

All Sweep Features:
- Frequency Sweep
    - low => high, high => low
    - repeat mode, siren mode
    - fixed or variable steps
    - custom sweep time
- Volume Sweep
    - set amplitude at start, set amplitude at stop
    - repeat mode, siren mode
    - custom sweep time
- Combined Frequency+Volume Sweep
    - low => high, high => low
    - set amplitude at start, set amplitude at stop
    - repeat mode, siren mode
    - fixed or variable steps
    - custom sweep time

In addition the new AudioEngine now supports improved on/off frequency ramping and a better handling of gain changes (smoothing).

Other changes/improvements:
- issue with playback Stop Timer fixed
- catching corner cases when closing app and stopping playback (soft ramp down)

### 9.0.1 — 2026-01-19

• Improvements when running the App on macOS / Apple Silicon
• Sweep improvements while repeat is active (frequency dependent volume ramping)
• added crossfading support for the balance setting

### 9.0.0 — 2026-01-08

• This update introduces major enhancements to all the popovers across the app, with a refreshed design throughout the app that better aligns with the visual improvements introduced in iOS 26.
• All popovers received a major design overhaul, better readability, larger content and improved usability
• In addition to the updated UI, we’ve also included several smaller fixes and performance improvements to ensure the best App experience.

### 8.4.0 — 2025-06-10

New in This Version:
• we've added a new balance control! Easily adjust the left/right stereo output for precise sound shaping.
• several improvements to musical notes playback

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## More apps by Thomas Gruber

- [EE ToolKit PRO](https://appshunter.io/ios/app/ee-toolkit-pro/id368780426)
- [EE ToolKit](https://appshunter.io/ios/app/ee-toolkit/id391792609)
- [EE ToolKit PRO for iPad](https://appshunter.io/ios/app/ee-toolkit-pro-for-ipad/id393145367)
- [Audio Function Generator](https://appshunter.io/ios/app/audio-function-generator/id768229610)
- [Resistor ToolKit, Color Codes](https://appshunter.io/ios/app/resistor-toolkit-color-codes/id1058581945)

All apps by Thomas Gruber: https://appshunter.io/developer/342699861

## Related topics

[audio function generator pro](https://appshunter.io/ios/topics/audio-function-generator-pro) · [audio function generator](https://appshunter.io/ios/topics/audio-function-generator) · [function generator](https://appshunter.io/ios/topics/function-generator) · [function generator pro](https://appshunter.io/ios/topics/function-generator-pro) · [audio generator](https://appshunter.io/ios/topics/audio-generator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*