Product was successfully added to your shopping cart.

Fold - Delta Sound Labs

Quick Overview

At the heart of Fold is its wavefolding engine, and by using an assortment of modules in an in-series FX chain, Fold imbues input signals with harmonically rich overtones and, if pushed to the extremes, completely transforms them with a unique form of distortion.

Availability: In stock



Save by getting both Stream and Fold in the Delta Bundle

FOLD - Distortion Synthesis Plug-in

Fold is a distortion synthesis audio effect plug-in that only the engineers at Delta Sound Labs could dream up. Calling on their background in modular hardware design, the team has found a novel approach to creating warmth and distortion in software. By using an assortment of modules in an in-series FX chain, Fold imbues input signals with harmonically rich overtones and, if pushed to the extremes, completely transforms them with a unique form of distortion.

At the heart of Fold is its wavefolding engine. First pioneered by synth legend Don Buchla, wavefolding is the act of folding a wave back on itself after reaching a given threshold. While this naturally produces distortion and harmonics, Fold also ships with a bit crusher module to further smash the input signal. Fold's combination of oversampling, distortion, and wavefolding results in tones that are timbrally rich on one hand, and over-the-top destroyed on the other, even with simple periodic input signals.

"LOVE this. It's really useful, MUSICAL, and tweak-able in the best way. Feels endless, completely the opposite of so many 'one trick pony' type tools. WIDE RANGE of sonic possibilities!" — Anthony J. Resta (Duran Duran, Guster, Megadeth)

To tame the sound, Fold comes with an analog emulation of a resonant low-pass filter that offers more control over any unhinged results. Each parameter is also syncable to its own LFO, each of which has an amount slider and may be synced to a host tempo within a DAW for more creative sound design and mixing effects. Fold also ships with a number of professionally designed presets that showcase the versatility of its engine.


  • Hard and Soft Clip Distortion Morphing
  • Wavefolding
  • Bit Crushing
  • Analog Low and High Pass Filter Emulations
  • Four Syncable LFOs with Mappable Phase Reset Buttons
  • Three LFO Waveform Types
  • Mono and Stereo Processing
  • x16 Oversampling
  • Factory and User Presets
  • Optimized Preset Navigation

The Modules and Effects:

HP Filter

This is a TPT styled high-pass filter with resonance control. Great for creating filter sweeps on the front end using your automation lanes in your DAW.


Drive is an amplitude dependent distortion module. You can increase the drive amount by increasing the drive knob towards a value of 100. A value of 0 will not apply any additional gain or soft/hard clip distortion to your signal. You can crossfade between soft and hard clip distortion using the horizontal slider underneath the drive knob.


Wavefolding is a type of distortion synthesis that occurs when the amplitude of an audio input exceeds a defined threshold. The peaks that exceed the defined threshold are inverted into a series of folds producing rich timbres and textures. This kind of distortion synthesis excels when used on simple sounds like sinusoids or standing waves, even single guitar notes.


Crush allows you to quantize your incoming signal to emulate the classic bit crushing effect. Both depth and rate are tied to one single knob and scaled in such a way to leverage this kind of distortion synthesis as best as possible. Try combining this module by changing your oversampling factor using your automation lanes.

LP Filter

This low-pass filter is modeled after an analog low-pass resonating filter. There is a resonance control slider underneath the filter frequency cutoff knob in a similar fashion to the high-pass filter on the front end of the signal chain. This filter is ideally placed in the in-series signal chain to tame and sculpt your unwieldy distorted textures.


Each module has its own dedicated Low Frequency Oscillator. Each LFO has its own dedicated amount slider located next to the LFO Speed slider. You can choose from sine, square and saw waveform types.

FX Amount

The FX knob allows the user to control the amount of the in-series effects chain is applied to an incoming audio signal. Each module has a bearing on the next module along, so try automating this control to create some gnarly modulations.

Toolbar View

Use the preset combo box to select any of our factory presets or make and recall your own presets. You can use the nudge buttons to quickly audition presets.

Stereo/Mono Combo Box

Use the combo box to choose mono or stereo processing.

Creative Strategies with Fold

Fold yields extremely interesting results with low frequencies—try folding your kick drum, any bass register instruments, or simply a sine wave from your synth! Fold can also be used to add high-frequency energy to a synth lead line. This works well in combination with Fold's FX Amount parameter, allowing you to dial in the exact amount of energy you want. Distortion has long been essential to guitar players—Fold's unique combination of distortion and wavefolding on electric guitars is worth a lengthly exploration. Try with chords or even bass lines on lower registers.




Recommended: Mojave or Catalina (10.14 or 10.15)

Minimum: High Sierra 10.13 (this was the earliest OS that was tested in development stages)


Minimum and Recommended: Windows 10

Cookie Notice
This website uses cookies to provide a seamless browsing and shopping experience. By using this website, you agree to our use of cookies.