Freedom251 › Software Synthesizers
Sylenth1
What Sylenth1 is
Sylenth1 is a virtual analog VSTi synthesizer for music production on Windows and macOS. Four unison oscillators can each produce eight stereo voices, reaching 32 voices per note; 16-note polyphony allows up to 512 oscillator voices simultaneously. Two four-stage filter sections include nonlinear saturation and drive control. Modulation includes two ADSR envelopes, two LFOs, two additional amplitude envelopes, velocity, keyboard tracking, and modulation-wheel sources. The master section provides an arpeggiator, distortion, phaser, chorus/flanger, equalizer, delay, reverb, and compressor. An onboard browser contains more than 2,500 presets, and MIDI learn assigns CC, RPN, or NRPN controls. Sylenth1 runs in compatible VSTi, AU, and AAX hosts rather than as a standalone app. The full version costs €139, paid once, or €9.95 a month in installments until paid. A demo has playback, modulation, preset, and skin restrictions.
Who it suits
It suits music producers using compatible plugin hosts who want extensive synthesis, modulation, effects, and preset options.
What it does well
- Up to 512 oscillator voices simultaneously
- Includes more than 2,500 presets
- Supports VSTi, AU, and AAX hosts
- Offers extensive built-in effects
- Can activate on two computers
What to know first
- No standalone application
- Demo plays a reminder sample periodically
- Demo limits modulation and preset saving
- Full version costs 139.00 EUR
Limits
The demo plays a reminder sample about every 60 seconds, disables half the modulation options and preset saving/export, and limits use to 128 presets and one skin. The installment license is put on hold when payments stop and requires an internet connection at least once each month until paid in full.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Sylenth1 full version | One-time payment · VST/AU/AAX, x86/x64 · 2 computer activations · full functionality · 2500+ presets · free updates | €139, paid once |
| Sylenth1 installment plan | Monthly installments until the full amount has been reached · License is put on hold while payments are stopped · internet connection required at least once each month · keep full license after all installments are paid | €9.95 a month |
As lennardigital.com lists them, read 9 Oct 2026. The maker's own page has the final word.
Getting started
- Open the LennarDigital Sylenth1 website
- Choose the free trial or a paid license
- Install it in compatible VST, VST3, AU, or AAX host software
- Activate the license on up to two computers
- Use offline activation instructions when activating without internet
Verdict
Sylenth1 offers a broad virtual-analog synthesis engine with substantial polyphony, modulation, effects, and presets. Buyers should account for its host-plugin requirement and the restrictions of the demo version.
Questions
How much does Sylenth1 cost?
The full version costs 139.00 EUR as a one-time payment. An installment plan costs €9.95 a month until the full amount is reached.
Is there a free trial?
Yes. The demo has playback, modulation, preset-saving, preset-count, and skin restrictions.
Which systems and formats are supported?
Sylenth1 supports Windows 7/8/10/11 and macOS 10.9 or higher on ARM or Intel. It supports VST, VST3, AU, and AAX hosts.
Can it run without internet?
The license FAQ provides instructions for activating Sylenth1 on a computer without internet.
How many computers can use one license?
It can be installed and used on two computers at the same time, including Mac and PC computers.
Does it work as a standalone app?
No. Sylenth1 is designed for compatible plugin host software.
Facts from Sylenth1's own pages
- Activation limit
- Sylenth1 can be installed and used on two computers at the same time, and can be used on Mac and PC. · lennardigital.com, 9 Oct 2026
- Demo limits
- The demo plays a reminder sample about every 60 seconds, disables half the modulation options and preset saving/export, and is limited to 128 presets and one skin. · lennardigital.com, 9 Oct 2026
- Effects
- Its master section includes an arpeggiator and distortion, phaser, chorus/flanger, equalizer, delay, reverb, and compressor effects. · lennardigital.com, 9 Oct 2026
- Filters
- It includes two four-stage filter sections with nonlinear saturation and drive control. · lennardigital.com, 9 Oct 2026
- Formats and hosts
- Sylenth1 supports VSTi, AU, and AAX compatible host software. · lennardigital.com, 9 Oct 2026
- Maker
- LennarDigital says it is based in Vught, the Netherlands, and was founded in 2006 by DSP and software engineer, producer, and sound designer Lennard Addink. · lennardigital.com, 9 Oct 2026
- Modulation
- The product page lists two ADSR envelopes, two LFOs, two additional amplitude envelopes, and modulation sources including velocity, keyboard track, and modulation wheel. · lennardigital.com, 9 Oct 2026
- Offline activation
- The license FAQ says Sylenth1 can be activated on a computer without internet and links to instructions. · lennardigital.com, 9 Oct 2026
- Operating systems
- The listed requirements are Windows 7/8/10/11 (32/64-bit) or macOS 10.9 or higher on ARM or Intel. · lennardigital.com, 9 Oct 2026
- Oscillators
- It has four unison oscillators, each capable of eight stereo voices, for up to 32 voices per note. · lennardigital.com, 9 Oct 2026
- Polyphony
- Its 16-note polyphony allows up to 512 oscillator voices simultaneously. · lennardigital.com, 9 Oct 2026
- Presets and MIDI
- The specifications page lists 2500+ presets, an onboard preset browser, and MIDI control with MIDI learn for assigning CCs or RPN/NRPNs. · lennardigital.com, 9 Oct 2026
- Product
- Sylenth1 is a virtual analog VSTi synthesizer designed for music production. · lennardigital.com, 9 Oct 2026
- Support
- The support page directs users to the manual and provides a support request subject selector and a link to the LennarDigital forum. · lennardigital.com, 9 Oct 2026
Where Sylenth1 stands on Freedom251
- Software Synthesizers#22 of 38