Velvet Machine

Sonic texture generator / blur / non‑linear reverb

Velvet Machine Screenshot

Velvet Machine is an audio effect based on real-time convolution with enveloped velvet noise. It's designed to:

  • Stretch and blur out even short sounds to lengths of up to 10 seconds
  • Produce reverb-like textures with flexible volume envelope (including reverse, fading in and out, pulsating etc.)
  • Work as a variable density random multi-tap delay (bordering on granular-like sounds)

Note for iOS users: At high settings, Velvet Machine can be quite CPU-intensive. A minimum of 5th Gen iPad, iPhone 6s or 1st Gen iPhone SE is recommended.


Velvet Machine playlist (9 videos)
Velvet Machine playlist (9 videos)


  • Flexible volume envelope with arbitrary number of segments and curvature
  • Effect time ranging from 50 ms to 10 s
  • Response density adjustable from 1 to 2000 repeats per second
  • Predelay up to 1 s
  • Host tempo sync for time and predelay parameters
  • High cut and low cut filters for the effected signal
  • Mix adjustable from 100% dry to 100% wet with no dry signal
  • Mix Lock to switch presets while keeping the dry/wet mix constant
  • 20+ factory presets to get you started
  • Fully resizable vector-based UI
  • Cross-platform preset format


The demo version is identical to the full version, except that the effect fades into gentle noise and back every minute, and does not save presets or state.


macOS 10.10+

AU 64-bit, VST3 64-bit
Intel and Apple Silicon (Universal 2 binary)

Windows 7/8/10 (64-bit only)

VST3 64-bit

iOS 12.0+

AUv3, Standalone
Universal (iPad and iPhone)


Version History


May 22, 2021
  • The Windows version no longer requires AVX and works on older SSE-only CPUs


May 12, 2021
  • Now also available as an AU and VST3 plugin for Mac and Windows!
  • Time and Density controls will now turn red when the effect is silent, i.e. Time is set too low to fit even a single impulse at current Density (e.g. density of 1 ips and time less than 1 s, 2 ips and time less than 500 ms, etc.)
  • Minor changes to the UI reflecting that we are now Phonolyth


December 10, 2020
  • Tempo sync option for time and predelay
  • Minimum time is now 50 ms and maximum predelay is 1 s. Presets saved with v1.0.0 will work, but you may have to adjust parameter automation in your existing host projects
  • Tweaked automatic gain correction. You may have to adjust the levels in your existing presets or projects
  • Updated UI including improved layout for smaller window sizes
  • Lowered minimum required iOS version to 12. Velvet Machine’s CPU usage is the same, so please make sure to read the description for device requirements
  • Various minor tweaks


October 16, 2020

Initial release (iOS only)