Sosir
Key Features
- The virtual-bow stage freezes incoming sound into a held, bow-like texture before the delay process.
- Sound Choice adjusts the sustained tone's base timbre and duration for different source material.
- A dedicated bow mix and sub-octave doubling help balance the original attack against the generated sustain.
- Low-pass and high-pass filters shape the frozen layer without requiring a separate EQ plug-in.
- Delay time, feedback, and LFO modulation turn the held signal into moving repeats or long reverb-like washes.
- Independent wet controls for the bow and delay stages make it easier to balance sustain and echo separately.
Description
Sosir is a freeze-delay effect from NUSofting that turns short, plucked input into a held, bow-like tone before feeding it into a modulated delay line. It is particularly effective on guitar attacks, but the same capture-and-sustain approach can turn synth notes, vocals, or percussion into slowly evolving ambient material.
The first stage is a digital virtual bow, where the Sound Choice control shapes the base timbre and duration of the sustained sound. A dedicated bow mix, sub-octave doubling, and low- and high-pass filtering let you retain a trace of the source or push it toward a more detached drone.
Its second stage adds delay time, feedback, and LFO modulation, with a separate wet control for the delay. Setting the delay time near or below the bow duration can merge repeats into a longer, reverb-like sustain rather than a sequence of distinct echoes.
That two-stage design makes Sosir more focused than a conventional delay: it supplies the initial held texture as well as the repeats. Editorial coverage and demos position it as an experimental sound-design tool for bowed guitar gestures, frozen washes, drones, and atmospheric transitions.
NUSofting currently lists Sosir as a €0.00 freeware effect and provides a visible Download Free form on the individual product page. The page offers VST3 for 64-bit Windows 10/11 and AU/VST3 for Mac, so that developer-controlled product page is retained as the one external download destination.
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Frequently Asked Questions
What does Sosir do differently from a normal delay?
Sosir begins by freezing part of the incoming audio into a virtual-bow sound, then sends that held texture to a feedback delay. A conventional delay repeats the input; Sosir can create the sustained source that the repeats build on.
Is Sosir only useful on guitar?
No. NUSofting frames the effect around changing a pluck into a bowed sound, so guitar is a natural source, but coverage of the plug-in also notes uses on synths, vocals, and other material. Short or percussive sounds are useful starting points when you want the frozen layer to contrast with the original attack.
How can I make Sosir create a long ambient wash?
Use the Sound Choice control to establish the sustained layer, then raise delay feedback and blend the two wet controls to taste. The developer notes that delay times near or below the arcata duration can make repeats merge into a longer, reverb-like sustain.
What plug-in formats does Sosir provide?
The current NUSofting product page labels the Windows download as VST3 64-bit for Windows 10/11. Its Mac download is labeled AU/VST3 Mac.
