Stereo width
Small differences in left and right pitch and delay add stereo width to vocals and instruments.
Subtle detuning
Dry / ProcessedComing soon
Dual-voice pitch shifter & delay
A few cents.
A lot more space.
Two separately tuned voices, from subtle doubling to harmonies and pitch-shifting echoes. The character of an ’80s digital rack processor, rebuilt from the ground up.
Explore featuresTwo voices. More width. New harmonies.
Combine pitch, delay and feedback.
Three-part harmony
Tune the two voices to different intervals. In Layered mode, blend in the dry signal for three-part harmony.
Harmony
Dry / ProcessedComing soon
A new pitch with every repeat
Raise feedback to send each returning sound through both pitch voices again. In Layered mode, the voices share a feedback input, so their pitch intervals combine over successive repeats. The diagram shows equal, opposite pitch intervals and matching delays.
Pitch-shifting delay
Dry / ProcessedComing soon
Layered & Dual
The difference is in the input and feedback routing.
Layered
One input, two voicesCreate two pitches from a combined input. Both voices feed back into that same input, layering more pitches with each repeat.
Delay per voice Up to 1,000 ms
Dual
Two independent channelsProcess left and right separately. Feedback stays within each channel, so each repeat rises or falls by the selected interval.
Delay per channel Up to 1,000 ms · Feedback stays within each channel
LFO
Modulation connections,
at a glance.
Drag a cable to the knob you want to modulate. Here, the LFO controls left pitch. Each cycle moves pitch up and down by as much as 400 c, with the knob’s indicator and value following along.
- Waveforms
- 38 shapes (19 CLASSIC · 19 EXTENDED), from sine waves to ramps and random patterns.
- Rate
- In Hz or note values synced to your DAW tempo.
- Range
- Depth and phase. Bipolar or unipolar, with retriggering.
PARAMETER BIND
One knob,
from doubling to echoes.
One Bind knob moves several parameters together over defined ranges. Here, Bind 1 controls right-channel pitch, delay and feedback in Dual mode. At one end is 24 ms doubling; at the other, echoes descending in perfect fifths. Everything between them fits within one turn of the knob—and you only need to automate that one knob in your DAW.
- Pitch
- R 0 → –700 c
- Delay
- R 24 → 324 ms
- Feedback
- R 0 → 55 %
PurlShift
User manual
From initial setup to LFO and Bind connections and saving presets. Find the operation you need in the manual.
Read the manualSpecifications
Audio plug-in for macOS
- Operating system
- macOS 11 or later · Apple Silicon Tested on macOS 15
- Formats
- Audio Unit · VST® 3
- Channels
- Mono · stereo I/O
- Pitch
- −2 to +1 octaves
- Delay
- 0–1,000 ms in both modes Independent left/right settings · tempo sync
- Presets
- 53 factory presets · save your own presets
Parameter ranges and features
| Parameter | Range | Default |
|---|---|---|
| L / R Pitch | –2400 ~ +1200 c | +9 / –9 c |
| L / R Delay | 0 ~ 1000 ms | 12 / 24 ms |
| L / R Feedback | 0 ~ 100 % | 0 % |
| L / R Mix | 0 ~ 100 % | 100 % |
| Low Freq · High Freq | 0 ~ 47 · 0 ~ 4 | 12 · 2 |
| Source | 0 ~ 100 | 94 |
| Sustain | Off / On | Off |
| Bind 1–4 | 0 ~ 100 % | 0 % |
| LFO | 38 waveforms · Depth · Rate · Phase | Turned Off · 1.00 Hz |
| Levels | IN · OUT L/R ±48 dB · Trim ±24 dB | 0 dB |
| Master | Mix 0 ~ 100 % · Out –24 ~ +12 dB | 100 % · 0 dB |
- Settings saved in DAW projects · parameter automation
- LFO phase · bipolar/unipolar · clock sync · retriggering
- Master Mix for dry/processed blending · output and I/O trim
Latency by sample rate
| Project sample rate | Samples |
|---|---|
| 44.1 kHz | 0 |
| 48 kHz | 112 |
| 88.2 kHz | 205 |
| 96 kHz | 224 |
| 176.4 kHz | 411 |
| 192 kHz | 448 |
Compensation reported to the DAW. Does not include the delay inherent in pitch processing.
CatSiesta · PurlShift