BLEASS Alpha Synthesizer 4+

Versatile Polyphonic Synth


    • 4.8 • 76 Ratings
    • $14.99
    • Offers In-App Purchases



Highly versatile analog polyphonic stereo synthesizer with arpeggiator, modulations, filters, motion sequencer & FXs.
Smooth & stable, full MPE and AUv3 compatibility.

The BLEASS Alpha Synth is a virtual analog polyphonic stereo synthesizer inspired by classic analog synths and enhanced by the BLEASS’ very own musical and technical approach.
The Alpha is a highly versatile Synthesizer that aims at bringing new ways of designing and playing an infinite constellation of sounds in the iOS music making universe.

The BLEASS Alpha Synth offers many features that all musicians and producers alike will enjoy using in their music making process:

SIMPLE & INTUITIVE INTERFACE: follow the direction of the audio signal : design your own synth sounds by tweaking each panel, from left to right.

VISUALISE YOUR SOUND : thanks to its user-friendly visual filters, sliders, LFOs and envelopes, quickly understand how to design your own presets.

CPU EFFICIENT: how many times have you experienced crackling sounds while making music in the studio or on stage? The BLEASS Alpha Synth aims at offering a smooth & steady experience on iPhones and iPads, whether used as standalone or as an Audio Unit (AUv3) into your favorite DAW.

A UNIQUE MOTION SEQUENCER inspired by modular synthesizers brings a new dimension to your pads, leads and sequences by offering a large amount of rhythmic and expressive modulation possibilities and which can be coupled with the arpeggiator.

UPCOMING UPGRADES AND NEW PRESETS: The BLEASS team has partnered with many artists & sound designers in order to continuously improve the BLEASS experience, so watch out for upcoming updates bringing more features and new presets!

Technical specifications :

Synth Engine :
- Mono / Polyphonic synthesizer
- MPE Compatible: Timbre & Pressure parameters
- More than 200+ factory presets as well as over 220+ additional presets
- Built-in arpeggiator with beat sync
- BLEASS’s Motion Sequencer for rhythmic & expressive modulation
- 2 stereo + 1 mono fine-tunable oscillators with variable waveshapes & pulse widths
- Phase control on stereo oscillators for wide stereo
- Unison settings multiplying oscillators per voice
- Cross & ring modulation between oscillators
- Modulation wheel has destination control
- Hard sync
- 1 noise source
- 2 LFOs per voice with multiple waveforms & multiple modulation targets
- 2 variable state filters with drive settings
- 3 ADSR with multiple modulation targets
- assignable modulations targets for the Modwheel
- modulation destinations : Volume, Pan, Pitch, Osc3Level, Vibrato Amount, LFOs, Cutoff, Res., OscMix, OscXMod, RingLevel, OscPW, OscWave, OscPitch...
- Vibrato parameters : speed & amount
- Master Detune parameter
- Advanced presets management: import / export multiple presets, assign category, rename, edit

Built-in Effects :
- Overdrive
- Bitcrusher
- Tremolo
- Delay with filter and ping-pong effect
- Reverb with length, filter and color control

Misc :
- Built-In Keyboard with pitch-bend and modulation wheel
- Midi compatible
- Midi over Bluetooth
- Audio Unit V3 compatible
- Ableton Link
- Bluetooth Audio
- 200+ factory presets designed by our dear friends Jordan Rudess, Mark Lion, Torley, La Phaze, Nu-Trix, Electronisounds, the Garageband Guide, the Beat Community... (More presets to come along with the upcoming updates!)
- Store your own presets and share it across the Standalone and AUv3
- MPE Pressure uses Force Touch (for compatible devices)

What’s New

Version 1.12

New presets pack by The Sound Test Room + minor bug fixes & improvements.
BLEASS Alpha is also available for desktop! visit for more information

Ratings and Reviews

4.8 out of 5
76 Ratings

76 Ratings

Deltacaster ,

Excellent for sound design

Every aspect of this powerful synth can be modulated externally and internally.

What does that mean? You can do a lot of cool and weird stuff with it you’ve never heard before and make a variety of nice synth sounds.

Works pretty well on all iPads as well, iPad Pro is not necessary, all of Bleass apps have very efficient programming and are friendly on your CPU usage.

Nitpick Pete ,

Basic sounds…

They are decent noises, and tons of them, but most are rather uninspiring. There are a few gems that have space in my faves so definitely keeping the fully loaded app in the mix.

Speaking of mix, while most of the sounds by themselves are perhaps a bit lackluster, they leave a lot of room in the audio spectrum for other tracks, and sometimes this app offers just the perfect patch that fits nicely in the mix.


Don’t hesitate on this one, just buy it. Seriously.

Can y’all have a meeting with all the other iOS synth developers and let them know how important it is to have a CPU friendly smooth running app? The best sounds in the world don’t mean much if it’s crackling and crashing every other time.

Developer Response ,

ah ah! Well thank you! indeed we focus on high stability and efficiency and so do other developers! but it's not always easy considering many parameters (buffer / daw / iPad specs)...

In-App Purchases

The Sound Test Room Pack
110 presets designed by Doug Woods.
MPE Preset Pack #1
MPE presets designed for expressiveness!
Sound Of Izrael Preset Pack
50 presets by Sam!
Torley Preset Pack
Torley's amazing presets!

App Privacy

The developer, BLEASS, 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 Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

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

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