TB Flowtones 4+

Virtual Analog Synthesizer


    • 4.8 • 25 Ratings
    • $12.99



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 are not compatible with other platforms.
- Audio Unit (AUv3) extensions require an iPad mini 2, iPad 4 or later models.

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:

How to use this app as AUv3 plug-in in AUM - Audio mixer:

What’s New

Version 1.2.1

Stability improvements for certain AUv3 hosts

Ratings and Reviews

4.8 out of 5
25 Ratings

25 Ratings

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! :-)

Nitpick Pete ,

Better after diving in a bit…

…and extensively tweaking some presets. Rolled a few sound of my own and am starting to warm up to it. All of the harsh, blipity, digital crunchy presets are just not my cup o’ tea, I guess. But even those sounds are easily manipulated into something more my tastes with simple envelope and filter tweaks. The unison knob is just too tempting…really fattens it up. The UI is pretty friendly and easy to navigate. Quite nice effects. Formant bit is a blast.

Okay, I’ll give it another shot.

Developer Response ,

Thanks for the feedback! Hope the second shot worked out well!

Greg.ni ,


This app is so awesome & I highly recommend it.
Improvement request:
You need to make the Black Keys shorter so we can have more space on the white keys especially in the middle where the Apple slide up bar is.
on screen keyboard is unplayable because of these two factors please make the keyboard better and this app would be perfect

Developer Response ,

Thanks much for the feedback!

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

    Up to six family members can use this app with Family Sharing enabled.

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