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Track FX & Audio Processing (ADD FX)

Overview

The ADD FX rack allows you to shape, color, and process individual track stems in real time without leaving the Stable Audio environment. Each generated track lane features its own dedicated effect slot where you can chain built-in dynamic processing presets or program entirely custom digital signal processing (DSP) algorithms using the FAUST programming language.

Accessing the FX Rack

  1. Navigate to the Multitrack Session View.
  2. Locate the track strip you wish to process.
  3. Click the ADD FX button on the channel controls strip.
  4. The FX TRACK [XX] slide-out panel will open on the right side of the screen.

Built-In Quick FX Presets

Stable Audio includes seven single-click DSP presets designed for common mixing and sound design tasks:

  • ECHO (Delay): Applies tempo-synced delay repeats to create spatial depth, rhythmic slap-backs, or wide stereo tails.
  • PLATE (Reverb): Inserts a smooth, spacious plate reverberation algorithm ideal for smoothing out synth pads, guitars, or vocal elements.
  • SAT (Saturation): Introduces warm harmonic analog saturation and subtle tape-style overdrive to add weight and body.
  • LO (High-Pass Filter): Attenuates low frequencies to clean up unnecessary mud and low-end rumble from non-bass tracks.
  • HI (Low-Pass Filter): Attenuates high frequencies to roll off harsh top-end sizzle or create muffled, lo-fi filtering effects.
  • CHR (Chorus): Adds pitch-modulated stereo chorus to double sounds, enhance stereo width, and add organic movement.
  • BITS (Bitcrusher): Reduces digital audio resolution and sample depth to produce vintage digital grit, distortion, and chiptune textures.

Custom DSP with FAUST Code

For advanced sound design beyond the built-in presets, Stable Audio supports direct code execution via FAUST (Functional Audio Stream), a functional programming language designed specifically for real-time audio signal processing and synthesis.

How to Generate Custom FAUST Effects

  1. Click into the custom FAUST effect text field at the bottom of the FX panel.
  2. Type a functional prompt describing your desired processing, or paste valid FAUST code directly into the box.
  3. Click GEN to compile the code and apply the custom DSP processor directly to the track's signal chain.

Rack & Chain Management

  • + (Add Slot): Click the + icon in the upper-right corner of the panel to instantiate additional processing modules, allowing you to build multi-effect signal chains on a single stem.
  • X (Close Panel): Click the X in the top-right corner to minimize the FX rack. Active effect chains will remain enabled on the track even when the panel is closed.