Released: Jun 22, 2021
Version: 1.0.2
Size: 915 MB
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SynthMaster 2

KV331 Audio
KV331 Audio is proud to announce the availability of their award winning software synthesizer SynthMaster 2.9 on iOS platform. As being the first app developed using KV331 Audio’s new cross-platform UI framework, SynthMaster 2 runs as a standalone app or AUv3 plugin on iPads with iOS 11 and above.

SynthMaster 2 supports native resolutions of various iPad devices. User interfaces are provided for 9.7, 11 and 12.9 inch iPads in 4 different skins (Blue, White, Dark, Proto). Separate interfaces are provided for the AudioUnit plugin as well.

SynthMaster 2 comes with 1000 factory presets designed by world class sound designers such as BigTone, Nori Ubukata, NatLife and Yuli Yolo. Thanks to the comprehensive preset browsing features, users can easily filter presets by author name, bank name, instrument type or preset name and find the sounds that they are looking for.

There’s also an IAP Shop, which lets users purchase additional sounds:

1. "Desktop Presets Upgrade": At the intro price of $4.99, this IAP adds all factory presets in SynthMaster 2.9, increasing the total preset count to 2000.
2. "All Expansions Bundle": At the intro price of $39.99, this IAP adds all current 32 SynthMaster preset expansion banks.

Sound Engine:

At the heart of SynthMaster 2’s powerful sound engine lies its oscillators, modulators, and filters.


The oscillators can operate in 4 different modes to generate sound:

1. In Basic mode, the oscillator plays single cycle waveforms or samples. With the Oscillator Unison turned on, up to 8 voices per oscillator can be played.
2. In Additive mode, 8 Basic oscillators can be stacked up to create richer tones.
3. In Wavetable mode, the oscillator can play wavetables with up to 256 frames.
4. In Vector mode, 4 Basic oscillators are mixed in 2 dimensions.


Modulators are simply basic oscillators that can be added to other oscillators or modulate other oscillators’ or modulators’ phases. By connecting modulators to other oscillators or modulators, complex FM tones can be synthesized.

Importing Wave Files into SynthMaster:

While designing sounds, users can easily import wave files into SynthMaster 2. SynthMaster 2 can categorize those files into waveforms, wavetables or multi samples and import them accordingly.


Once the sound is generated by the oscillators it goes through SynthMaster’s filters, which can operate in 6 different categories: Digital, VAnalog, Ladder, Diode Ladder, State Variable and Bite.

Custom distortion can be applied before or after the filters as well.

Modulation Architecture:

SynthMaster 2 features a comprehensive modulation architecture with a wide range of modulation sources:

1. MIDI controls
2. Macros controls
3. 4 ADSR envelopes per layer
4. 4 Multisegmented envelopes per payer
5. 4 LFOs per layer
6. 4 Sequencers per layer
7. 4 Keyscalers per layer

There’s real-time visual feedback that lets users see how modulation sources and targets are changing when a note is being played. This is extremely helpful when designing sounds with SynthMaster 2.

New modulations can be created easily by dragging and dropping a modulation source onto a knob or slider control.

Users can easily see which controls are modulated by a modulation source by clicking on that source. Controls that are being modulated by that source will display modulation amounts. By long pressing a control, the modulation amount can be edited without the need to go through the mod matrix.


SynthMaster features a comprehensive arpeggiator / sequencer with 32 steps. Users can easily create sequences by recording steps one by one.


Each of the 2 layers in SynthMaster has 5 insert effect slots. 13 different types of effects can be instantiated in any of those slots. There are also 2 global effect send busses which can be used to create more complex effect routings.

What's new in version 1.0.2
New Features:

1. Users can now restore SynthMaster Player iOS iAPs
2. Users can now import/export presets

Bug Fixes:

1. Restore IAP button is not functional
2. When user taps the browse button for the 2nd time, navigation should go back to the previous tab
3. Modulation target dropdown control is not functional
4. When modulation target filter is changed, modulation matrix is not updated
5. When a modulation source is dragged onto a target control, modulation matrix is not updated
6. SynthMaster doesn't select correct UI layout in AudioUnit version
7. 'Show Settings' and 'About SynthMaster' menus don't work in AudioUnit version
8. 'Contact us' menu should not be visible in AudioUnit version
9. Container controls are not resized correctly
10.Global parameters are not saved in Audionit version
11.Browser banks list items are not sorted
12.When the value of tempo textbox is changed, that's not reflected in the synth engine
13.Vector osc xyview doesn't show on AudioUnit version
14.SynthMaster crashes after presets are downloaded from server
15.When a preset is saved under a sub folder under 'Presets' folder, the sub folder name should be interpreted as the bank name
16.Rename preset menu is not functional
17.SynthMaster doesn't display purchase status of IAPs/expansions correctly
18.Arp bypass is incorrectly linked to Layer bypass (blue skin)
19.Choosing "FM" as modulation type for osc/mod selects "PM" instead

Known Issues:

1. iPad Pro M1 devices running on MacOS 14.5 and above create intermittent crackes. Please report this issue to Apple!
Our verdict: Good
  • + SynthMaster 2 is a highly rated app (4.5-star).
  • + SynthMaster 2 is currently ranked #25 in paid Music apps for iPad.
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SynthMaster 2

Developer: KV331 Audio || Version: 1.0.2