SynthMaster One

SynthMaster One is a wavetable synthesizer for Windows, macOS and iOS. It is best suited to producers who want to shape sounds from imported waveforms and use a synth both in a DAW and on its own. The desktop edition makes the strongest case, pairing a deep sound engine with a large preset library.

Overview

KV331 Audio’s instrument combines an approachable workflow with tools for building sounds rather than relying only on presets. Desktop users get oscillators, filters, modulation, sequencing and effects in each instance, while wavetable imports let them expand the sound sources they work with.

The versions differ materially: desktop provides 32-voice polyphony and 1,250 presets, versus 16 voices and 650 presets on iOS. That makes the iPhone app a useful entry point, but not a like-for-like substitute for desktop when a project needs more simultaneous voices or the larger preset set.

Key features

• Wavetable import: Import wavetable files or add them to the SynthMaster One Waveforms folder. This gives sound designers room to work beyond the included waveforms.
• Desktop sound engine: Each instance has two oscillators, two sub oscillators, two filters, four ADSR envelopes, two LFOs, a 16-step arpeggiator/sequencer and 11 effect types. The range makes it possible to shape and sequence sounds within the instrument, rather than depending on separate tools for each stage.
• MIDI patterns and tuning: Drag MIDI patterns into the arpeggiator and use Scala tuning files. Pattern import is useful for adapting existing MIDI material to the synth’s sequencing workflow.
• Presets and sync: Desktop includes 1,250 factory presets. KV331 Audio says users can synchronize presets, waveforms, samples, favourites and MIDI programs across machines and platforms.
• iOS DAW and file support: The iOS app supports AudioUnits V3, including multiple instances in compatible DAWs such as GarageBand, Cubasis and Beat Maker. Through Files on iOS 11 or later, it can import and export presets, waveforms and scales.

Pricing

The desktop SynthMaster One costs $49.00 one-time for Mac and Windows. It is the clearest fit for producers who want the full preset library, 32-voice polyphony and desktop formats. The iOS Universal App costs $9.99 once for iPhone and iPad, offering a lower-cost option with 650 presets and 16-voice polyphony.

The iPhone Only App is free and runs on iPhone, not iPad; it also has 650 presets and 16-voice polyphony. It suits someone who wants to try the instrument on an iPhone, but its device restriction and lower capacity make it the least flexible choice. The desktop demo is another way to evaluate the synth: it includes 650 factory presets, disables preset saving and stops working after 15 minutes.

Platforms

On Windows, SynthMaster One runs as a VST instrument or standalone application. On Mac it runs as a VST or Audio Unit instrument, and on iOS as an Audio Unit instrument. The iOS app’s multi-instance DAW support is useful for mobile production, while standalone desktop operation suits users who want to open the instrument outside a host.

Who it's for

Choose SynthMaster One if you want a wavetable instrument with substantial desktop sound-shaping controls, MIDI pattern import and the option to expand its waveform library. The iOS version makes sense for mobile use or a lower-cost start, provided its smaller preset library and lower polyphony meet your needs. If you need the desktop capacity, the iPhone app is not an equivalent replacement.

Pros and cons

• Pros: Desktop combines two oscillators, dual filters, modulation, sequencing and 11 effect types in each instance, giving sound designers a broad toolkit in one instrument.
• Pros: Wavetable import and drag-and-drop MIDI pattern support let users bring their own source material and patterns into the workflow.
• Pros: iOS AudioUnits V3 support allows multiple instances in compatible DAWs, and the Files integration supports moving presets, waveforms and scales.
• Cons: iOS has half the desktop polyphony and 600 fewer presets, limiting its capacity compared with the desktop edition.
• Cons: The free iPhone app does not run on iPad, and the desktop demo cannot save presets and ends after 15 minutes.

Alternatives

Browse software synthesizers for more options. Consider Vital instead if you want a free Basic plan with full synth features, 75 presets and 25 wavetables, or its $5 monthly subscription with store credit and subscriber-only packs. Surge XT is a free, open-source virtual instrument plugin for Windows, macOS and Linux. Choose Cardinal if a free, open-source option across desktop and web is the priority; its builds include built-in modules, but modules cannot be added to an existing build. Dexed is a free option for users who want software under the GPL v3 license. Helm is another free choice, available as a standalone app or plugin on Linux, Mac and Windows. Sonic Pi is free and open source. VCV Rack offers a free, open-source core with free modules. DefleMask has a free legacy demo and a $14.99 one-time plan.

Verdict

SynthMaster One is a strong choice for producers who want a capable desktop wavetable synth, particularly if importing waveforms and MIDI patterns matters to their sound design. Its desktop engine and preset library are the main reasons to choose it; look elsewhere if you need a free desktop synth or want the iOS version to match desktop capacity.