TB Flowtones Virtual Analog Synthesizer

Thanks to it's true VA synthesis engine, the use of analog-modelled non-linear filters and extensive modulation options, Flowtones sounds warmer and more analog than digital romplers and wavetable-based synths.

TB Flowtones comes as stand-alone app (with IAA support) as well as AUv3 plugin.

True virtual analog synthesis features:
- 4 VCO architecture (two voice layers with two VCOs each)
- 4 synthesis engine types, in part modelled after famous analog synthesisers
- 36 analog VCO waveforms featuring all classic waveforms and more
- All VCO waveforms support pulse width modulation
- Full stereo and mono unison modes for each VCO independently
- Noise and subharmonic oscillators for each VCO
- Unique ring and self-modulation matrix
- High-quality, warm, non-linear filters (VCF) with over 30 filter types, including unique multi-resonance filters

Modulation features:
- Four LFOs with 30 waveforms each
- LFOs can modulate other LFOs, including themselves!
- Three additional envelope generators, with key velocity modulation
- Quick access to modulation strengths through context menus
- Hundreds of modulation signal paths available
- LFOs can produce noise as waveform to randomly modulate other parameters; for example to simulate slight variations in analog filter parameters as they happen in analog circuits.

Pro-grade effects
- Studio-quality reverb, delay, and chorus effects
- Unique formant filter to add vocal character
- Analog and digital distortion / bit crushing effects
- Master equaliser and peak limiter for final touch
- Non-linear power supply simulation for authentic interaction between notes

Step sequencer
- Fully integrated, intuitive step sequencer
- Can trigger chords and note series / phrases
- Can run asynchronously or synchronously to the host
- Smart copy/paste of note series to improve workflow
- Smart zoom: edit fine details while keeping an overview over the full sequence

Presets and intelligent randomizer
- Flowtones comes with hundreds of presets to spark your creativity
- Intelligent randomizer to explore endless sound synthesis possibilities

What you should know:
- Inter-App Audio (IAA) can only use one instance of this app simultaneously. We recommend to use an AUv3 host to use multiple instances.
- Licenses acquired for this platform (iOS, iPadOS) are not compatible with other platforms.

How to use this app as AUv3 plug-in in Apple Garageband for iOS:

How to use this app as AUv3 plug-in in Steinberg Cubasis for iOS:

How to use this app as AUv3 plug-in in Audio Evolution Mobile Studio for iOS:

What’s New

Version 1.1.3

- New pin functionality to pin modulation displays
- Improvement in import/export of libraries
- User library and categories can now be renamed by double clicking the name
- Efficiency and stability improvements

Ratings and Reviews

5.0 out of 5
26 Ratings

26 Ratings

cmruko ,

Toneboosters is Top Notch

Everything TB has released is extremely high quality, reasonably priced, and their first synth does not disappoint. It is capable of producing so many different types of high quality sounds, keys, pads, leads, bass, soundscapes, etc. The patch randomization feature is one of the best I’ve ever seen in terms of continually producing quality results. I’ve created so many presets with randomize and some tweaking. I’ve actually shared my presets for the first time ever thanks to this synth. 2 packs of 20 patches in each. Others have too, in the AB forum. Great sound, great developer, this was an insta-buy for me and I’m glad I did. Thanks TB!

Morgman73 ,

Such a good sound.

This is my new favorite synth by light years. These TB developers are so smart, so forward thinking. You guys really did a great job on this synth and it sounds so beautiful, interesting and it’s super versatile once you wrap your head around the workflow. 10 stars.

Developer Response ,

Thanks so much! :-)


Another fine Toneboosters app

Loving the sounds you can get with this beast! One thing can you add a way to have favorite patches or a rating option? Didn’t see this anywhere with my initial play around.

Developer Response ,

Thanks for your response and suggestions!

App Privacy

The developer, ToneBoosters, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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