The Klowra Vein is a stereo polyphonic pitch shifter from Klowra, a pedal that puts several studio-style pitch tools in one box. Pedal of the Day's review describes it as a device that "seamlessly integrates four core studio effects, Harmony, Pitch Shifter, Detune, and Glide/Ramp, into a single footprint"1. It sits in the octave and pitch family alongside Klowra's other polyphonic pedals, such as the Klowra Verdict Polyphonic Octave and the Klowra Leap Polyphonic Octaver, and it belongs with other octave and pitch pedals that handle chords rather than single notes.
What it does
The Vein's four modes cover the main jobs a pitch shifter is asked to do1:
| Mode | What it is for |
|---|---|
| Harmony | Playing intervals above or below the played notes |
| Pitch Shifter | Straight shifting of the note or chord |
| Detune | Thickening a part with a slightly off-pitch copy |
| Glide/Ramp | Sliding between settings rather than stepping |
Under the hood, Klowra says the pedal runs "two completely independent pitch-tracking algorithms"1, and the tracking is specified at an "8ms ultra-low latency polyphonic tracking algorithm"1, which the maker describes as an industry-low figure.
Because it is a true stereo unit, the Vein can do more than shift a mono signal. Pedal of the Day notes the pedal uses "the microtonal true stereo engine to flawlessly simulate Automatic Double Tracking (ADT)"1, the studio trick of doubling a part with a slightly detuned copy.
Controls and operation
A single footswitch navigates the pedal's range: "a single footswitch allows you to freely navigate across a massive 17-interval, +/- 2 octave range"1. The pedal also carries "independent Attack/Release controls and a dedicated Ramp function"1, giving a player control over how shifts and ramps respond to picking dynamics.
In summary, the operating features are:
- Four modes: Harmony, Pitch Shifter, Detune, and Glide/Ramp1
- A 17-interval range spanning two octaves up or down, navigated by one footswitch1
- Independent Attack/Release controls1
- A dedicated Ramp function1
- An independent dry-signal output alongside the shifted signal1
- Selectable True Bypass or Buffered Bypass1
How it tracks
Pitch shifters are judged on how they handle difficult playing, and this is where the review makes its strongest claim. On pinch harmonics, a common trouble spot for polyphonic algorithms, the reviewer found the pedal preserved the instrument's original attack and dynamics1.
What reviewers said
Pedal of the Day's verdict was that "The Klowra Vein is the ultimate pitch shifter"1.
"The Klowra Vein is the ultimate pitch shifter"
The same reviewer placed the pedal in the context of Klowra's wider range, writing that "these pedals have been packed with more features and options than units costing three times as much, and they sound grea[t]"1.
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Questions
Is the Klowra Vein true bypass?
Yes, and it is switchable. The Vein offers selectable True Bypass or Buffered Bypass, so a player can run it hardwired when it is off or leave its buffer in the chain if the pedalboard needs one. Pedal of the Day's review covers both options in its write-up of the pedal's bypass and output arrangements.
What intervals can the Klowra Vein play?
The Vein covers a 17-interval range spanning two octaves up or down, and a single footswitch navigates across that range. It is a microtonal true stereo engine, so it can also be used for effects such as Automatic Double Tracking simulation, according to Pedal of the Day's review.
Does the Klowra Vein have a separate dry output?
Yes. The Vein provides an independent dry-signal output alongside its shifted signal, which lets a player send the dry and effected tones to different amps, channels or recording inputs rather than blending them inside the pedal.
Does the Klowra Vein work in stereo?
Yes. Pedal of the Day describes the Vein as a true stereo unit built on a microtonal true stereo engine, and it carries two completely independent pitch-tracking algorithms. The stereo engine is also what allows the pedal to simulate Automatic Double Tracking.
Sources (1)
- Klowra KBS-04 Vein Stereo Polyphonic Pitch Shifter, Pedal of the Day, 2026-10-18
