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 Fathom Synth by Seaweed Audio is a Virtual Instrument Audio Plugin. It functions as a VST Plugin and an Audio Units Plugin.
Fathom Synth
Product Fathom Synth
Developer Seaweed Audio
Price (MSRP) Free (Mono) / $45.00
Type / Tags
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
 2.3.0  Downloads Released
 2.3.0  Downloads Released
Supported Sample Formats (loads or saves) include
Audio Demos
Miscellaneous Information
Copy ProtectionNone

Version 2.3.0 Released

Version Changes

Seaweed Audio announces the release of Fathom Version 2.3. This version adds phase and pulse width modulation algorithms to the wave table oscillator, and includes additional presets designed for night club and motor show venues.

PayPal 48 Hour Delay

Please be advised that if you use PayPal and are outside the mainland USA, there is a 48 hour delay on receiving your order. This delay will not occur if you use a credit card. The delay is due to tighter security policies invoked recently by PayPal. If this happens to you please send a PM so we can issue you an temporary license.

Why is the payment I received under review by PayPal?

The delay is not caused by KVR or Seaweed Audio.

Supported Plugin Formats

Fathom provides a VST for Windows 32 (Fathom32.dll) and 64 (Fathom.dll), as well as Mac OS X Audio Units (Fathom.component) and VST (Fathom.vst).


Fully Modular, 16x16 Wave Table Morphing, Free Hand Wave Draw, Bezier Curve Oscillator, Single Cycle WAV Import Export, 5 Alias Free Oscillators, 30 Filters, 6 Effects, Bezier and Exponential Envelope Curves, Unlimited Modulations, 7 Types of Modulators, Real-time Host Automation, Resizable GUI, Free Mono Version, Direct Email Tech Support, Windows and Mac compatible.

Fathom Makes the Front Page of BPB Top 50 Free VST

BPB Top 50 Free VST Plugins of 2017

Read the BPB Magazine Review of Fathom

Bedroom Producers Blog Magazine Review

KVR Marketplace Purchasing Instructions

KVR Purchasing Instructions

Company Website:


New Fathom Video

Wave Morphing Utopia

Fathom Pro on Sale for KVR Members Only:

The members page is now by direct link only, password kvrpro.


Version Update Downloads


Fathom Synth:

Fathom is a new fully modular software synthesizer designed to meet the growing demand of producers and musicians to create original waveforms and complex modulations.

Wave Table Morphing Oscillator:

Two morphing tables of 16 waveforms each with modulating wave indexes for real-time wave scanning.

The ability to modulate and morph between the two tables creating a 2D scanning array.

Waveforms in the second table can be added or subtracted from the first.

Algorithms include morph, add and subtract, unipolar, bipolar, chop.

Animated graphs show the operand waveform, operator waveform and combination waveform in real-time.

Each waveform can be loaded or hand-drawn using the wave draw interface.

Waveforms can be auto-filled for perfectly smooth transitions between edited wave positions.

Individual waveforms can be saved and loaded, and entire wave tables can be saved and loaded.


Fully modular signal flow.

7 different types of oscillators including 5 alias free oscillators.

Bezier curve oscillator.

All oscillators include:

  • AM and FM synthesis.
  • Frequency ranged noise generator with built in filter.
  • Harmonic and random distortion section.
  • Detune section with nonlinear modulations and built in chorus.

31 different types of filters.

6 effects including two chorus, two reverb, phaser, digital delay with 3 channels, built in filters, feedback, and multiple sends.

Modulators: LFO, LFO Draw, ADSR, Multisegment Envelope, Sequencer, Random Sample and Hold, Keyboard Tracking and MIDI control, with up to 64 segments per envelope.

Modulation matrix: unlimited modulations per dial, unlimited dials per modulation.

Exponential and Bezier envelope curves.

The ability to draw your own waveforms.

The ability to export your own waveforms to wav format (pro version only).

Host automation of virtually every control on the instrument.

Over 200 factory presets and 150 factory waveforms all of which can be edited.

User Rated

Review Fathom Synth Now!

Discussion: Active


13 August 2017 at 9:26pmScrubbing Monkeys

I have been using Fathom for only a few months now. I started on version 1.0.7. At this point it is up to 1.0.11. It has a bucket load of features but a few that really grab me are the extremely powerfull envelopes and the built in delay. You can not only draw your envelopes but can double, triple............ and so on giving you a sequencer type feel. The delay is a three headed monster giving you COMPLETE control over left, right and center. This synth is capable of just about everything out there with alot of stuff we havent seen. I can see this being used alot for evolving soundscapes and one finger rhythmic dances. At this point it has a firm direction, is stable and a pleasure to program. Looking forward to the finer details.

2 January 2018 at 10:29pmbuing

Good blueprint, bad usability.

My score is 6.00.

11 January 2018 at 12:05pmmiketimothy

Trying to buy at discount price of $15 which is supposed to be available until 31st Jan 2018 but when I checkout it goes to full price ? Help please.

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Fathom Synth

Average user rating of 9.00 from 7 reviews

Seaweed Audio
 My KVR - Version Control & Lists
Not In Your MY KVR Groups
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52 people have added Fathom Synth to 8 My KVR groups 68 times
+4 in private groups

KVR Rank (Based on page views)

Overall: 40  34  40

30-Day: 10; 7-Day: 10; Yesterday: 6