Quick Start
Introduction
Thank you for choosing the Vein Pitch Shifter by Klowra. The Vein Pitch Shifter is a high-quality, low-latency polyphonic pitch-shifting pedal offering 17 pitch intervals. In addition to accurate pitch shifting, it provides precise pitch modifications, octaves, and harmonization. It also features LFO-based microtonal modulation to create expansive stereo fields or enhance multi-track layering.
The Vein Pitch Shifter supports both latched and momentary trigger modes and includes the exclusive Ramp modulation, found only in the Bloom Infinity Series. When paired with an expression pedal or external footswitch, the Vein allows for bold, expressive multi-stage pitch shifts with detailed shaping control. With Analog Dry-Through, selectable True or Buffered Bypass, and versatile stereo modes, the Vein ensures transparent tone and flexible performance in any setup.
Knobs and Switches
RATE
Adjusts the LFO's pitch modulation frequency. At the center position (12 o'clock), the modulation frequency is 2Hz, with a maximum oscillation of up to 10Hz.
DETUNE
Adjusts the stereo deviation of the microtonal pitch. The maximum deviation is 100 cents.
When RATE is set above zero, the pitch modulates up and down around the target pitch within the specified deviation range.
When RATE is set to zero, the left channel shifts slightly above the target pitch, while the right channel shifts slightly below it, creating a static stereo detuning effect.
MIX
Controls the mix between the dry and wet signals. At the minimum, it outputs full dry signal; at the maximum, it outputs full wet signal with no dry signal. A 50/50 mix occurs around 2 o’clock on the knob.
You can choose between two mix modes - Constant Power Mixer and Linear Superposition Mixer - depending on your tonal preference. For details on how to switch modes, refer to the *Power-Up Modes* section.
PITCH SELECT:
Selects the interval of the pitch-shifted note. The available intervals are:
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(-)② : Up (or Down) 24 Semitones
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(-)① : Up (or Down) 12 Semitones
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(-)p5 : Up (or Down) 7 Semitones
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(-)p4 : Up (or Down) 5 Semitones
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(-)M3 : Up (or Down) 4 Semitones
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(-)m3: Up (or Down) 3 Semitones
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(-)M2: Up (or Down) 2 Semitones
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(-)m2: Up (or Down) 1 Semitone
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UNI: Unison
For adjustments to negative interval, please refer to the *Description of the LED Button* section.
GLIDE:
Defines the process of activating and deactivating the Vein effect. The Vein supports both momentary (LED continuous orange) and latched (LED continuous white) switching modes to toggle the effect ON/OFF.
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Glide ATK:
Adjusts the attack time of the glide, determining how quickly it reaches the target interval upon activation.
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Glide RLS:
Adjusts the release time of the glide, controlling how gradually it fades back to the dry signal upon deactivation.
Footswitch
Control ON/OFF, Press & Hold to trigger Glide momentary or Ramp.
Refer to the *Glide* and *Ramp* section for details.
The LED Button
Lit when active, pressed or in combination with other knobs to adjust various functions and Hidden Parameters
Hidden Parameters
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Tone
Adjusts the high frequencies in the wet signal, allowing you to shape the tonal character of the effect. Increasing the tone emphasizes the higher frequencies, resulting in a brighter and more cutting sound, while decreasing it softens the effect, reducing harshness.
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RampATK
Controls the attack time of the Ramp modulation, determining how quickly the fade reaches the Snap-Set. A shorter attack time results in a quicker transition to the Snap-Set, while a longer attack time creates a smoother, more gradual fade.
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RampRLS
Controls the release time of the Ramp modulation, determining how gradually the transition fades back to the Panel-Set. A shorter release time results in a quicker return to the Panel-Set, while a longer release time provides a more drawn-out, fluid return to the Panel-Set.
For adjustments to Hidden Parameters, please refer to the *Description of the LED Button* section.
Rear Panel I/O
9V DC
Connect to a 9V DC power supply with a center-negative polarity and a minimum current rating of 250mA.
Note: If the power supply is insufficient, the pedal may malfunction.
IN L (Mono)
1/4" mono (TS) unbalanced left input for mono setups.
IN R (Stereo)
1/4" mono (TS) unbalanced right input for mono setups.
OUT L (Mono)
1/4" mono (TS) unbalanced left output for mono setups.
OUT R (Stereo)
1/4" mono (TS) unbalanced right output for stereo setups.
CTRL
1/4" stereo (TRS) balanced input for connecting an expression pedal or external footswitch.
Note: Please refer to the *External Control* section for information on how connection is recognized.
Signal Path
For optimal performance, place the Vein first in your signal chain. Placing other effects before it may interfere with its pitch-shifting accuracy.
Configuring the In/Out Settings
1-in, 1-out
Mono input with mono output. The dry and wet signals are mixed together in the mono output.
1-in, 2-out
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For the IN L, the dry and the wet sounds are mixed when stereo output.
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Dry/Wet Separation output : For the IN R, OUT R carries the dry signal; OUT L carries the wet signal.
*Dry/Wet Separation outputs allows a guitar signal to be split into two distinct paths: one carrying the unaffected (dry) sound, and the other carrying the processed (wet) effect signal. This configuration offers a range of creative and practical applications, particularly useful for live performances, studio setups, and
advanced signal routing. *
Note: You can select the outputs setting via the *Power-Up Modes*. Signal routing will vary based on the selected configuration.
Description of the LED Button
The LED Button is the heart of the Vein.
You can determine the current operating status of the Vein by observing the color of the LED button. The LED button can be pressed briefly or in combination with other knobs to adjust various functions or parameters.
Learning to interpret the LED colors and understanding the different ways the button can be pressed are essential for familiarizing yourself with the Vein’s operation.
What the LED Colors Mean
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White : Ramp function active; Vein ON/OFF is in latched mode.
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Orange : Vein ON/OFF is in momentary mode.
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Violet : Ramp is actively being triggered.
What the Button Can Adjust
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Toggle Glide Mode (Latched / Momentary)
Press&Hold to save the current parameter settings as Snap-Set.
The LED blinks violet to confirm.
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Save Snap-Set
Press & Hold to save the current parameter settings as Snap-Set.
The LED blinks violet to confirm.
Press & Hold while rotating the knob above the hidden parameters.
Successful adjustment is indicated by the LED blinking yellow.
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Adjustment of Negative Interval
Press&Hold while rotating the pitch select.
Successful adjustment is indicated by the LED blinking yellow.
Glide
Glide defines the way the Vein effect is activated and deactivated, offering a smooth, expressive transition between states. It enables controlled pitch shifting that can either engage instantly or fade in and out, depending on your performance needs.
Glide Modes
The Vein supports two modes for Glide:
Momentary Mode (indicated by a continuous orange LED)
The effect is active only while the footswitch is held down, allowing for real-time, on-the-fly pitch transitions.
Latched Mode (indicated by a continuous white LED)
The effect toggles on or off with each press of the footswitch, ideal for sustained use without needing to hold the switch.
These modes allow for versatile control, whether you want subtle pitch dips or dramatic, evolving transitions. The GLIDEATK and GLIDERLS parameters further customize how quickly the effect fades in or out when toggled.
Glide Momentary
When the LED button is set to orange (or when the effect is off, short-press the
LED button), the footswitch will be in momentary operation mode. When the LED
light is on, the pitch-shifting function is activated.
When the LED light is off, the pitch-shifting function is deactivated.
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Momentary Close
Short-press the LED button to switch to orange. Press&Hold the footswitch to fade the target pitch to the dry signal (LED turns off). Release to slide back to the target pitch (orange LED reactivates).
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Momentary Open (LED off)
Short-press the LED button With the LED off. Press and hold the footswitch to glide into the pitch (orange LED lights up). Release to glide back out (LED turns off).
You can control the operation of the Glide through an external device. For more Information setting up an external device, please refer to the *External Control* section.
*Press and hold the footswitch while the LED is white. When the LED turns violet, you’ve entered Ramp.*
Ramp allows for smooth, dynamic transitions between two sets of parameters:
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Panel-Set–Your current front-panel parameter settings.
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Snap-Set–A saved set of parameters stored using the LED button.
This feature creates expressive, evolving fades that add depth, movement, and emotion to your sound. The speed and character of the transition are defined by two parameters:
RampATK (Attack Time):
Controls how quickly the effect fades from the Panel-Set to the Snap-Set.
- A shorter attack gives a fast, sharp transition.
- A longer attack creates a smoother, more gradual fade.
RampRLS (Release Time):
Controls how quickly the sound returns from the Snap-Set to the Panel-Set.
- A shorter release results in a quick recovery.
- A longer release provides a more drawn-out, fluid return.
Ramp Modes
Like Glide, Ramp supports two switching modes - Momentary and Latched—giving you flexibility to match your performance style.
Momentary Mode:
Press&Hold the footswitch to fade into the Snap-Set over RampATK time. Release the footswitch to return to the Panel-Set over RampRLS time.
Latched Mode:
Press once to transition to the Snap-Set (RampATK), and press again to return to
the Panel-Set (RampRLS).
To select between Momentary and Latched modes, see the * Power-Up Modes* section.
Power-Up Modes
How To enter Power-Up Modes:
Press & hold the footswitch while powering on the pedal. A flashing LED indicates successful entry. Once your settings are configured, press the footswitch again to exit Power-Up Modes.
In this mode, you can adjust the following settings:
Bypass Modes
Switch between modes by short-press the LED button.
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True Bypass
The signal is routed directly through the pedal with no buffering or coloration.
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Green LED flashes to indicate True Bypass mode.
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Buffered Bypass(Trails on)
The signal is routed through a buffer with Analog Dry Through, allowing delay trails to continue after the effect is bypassed.
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Red LED flashes to indicate Buffered Bypass mode.
Outputs Setting
Select by rotating the RATE knob.
- Turn fully left for True Stereo (LED yellow flashes 3x).
- Turn fully right for Dry/Wet Separation (LED blue flashes 3x).
*Dry/Wet Separation stereo output allows a guitar signal to be split into two distinct paths: one carrying the unaffected (dry) sound, and the other carrying the processed (wet) effect signal. This configuration offers a range of creative and practical applications, particularly useful for live performances, studio setups, and advanced signal routing. *
Ramp Lock
Select by rotating the DETUNE knob.
- Turn fully left for Momentary (LED flashes yellow 3x).
- Turn fully right for Latched ( LED flashes blue 3x).
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Momentary:
Hold the footswitch to transition to Snap-Set over RampATK time. Release to return to the current set over RampRLS time.
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Latched:
The first press transitions to Snap-Set over RampATK time. The second press returns to the current set over RampRLS time.
MIX Modes
Select MIX Mode by rotating the MIX knob.
- Turning it fully left selects the Constant Power Mixer (LED yellow flashes 3x).
- Turning it fully right selects the Linear Superposition Mixer (LED blue flashes 3x).
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Constant Power Mixer
In this mode, the wet and dry signals are mixed in a way that maintains consistent power across the mix. This means that the volume of the wet signal will increase or decrease in relation to the dry signal to maintain a balanced overall sound, with no excessive gain or loss when blending the signals.
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Linear Superposition Mixer
This mode blends the dry and wet signals using a linear approach, meaning the signals are simply added together at equal strength, without adjusting for perceived loudness. This results in a more direct, unaltered blend of both signals, which may introduce some dynamic changes depending on the level of the wet signal.
LED Brightness
Adjust by rotating the GlideRLS knob.
- Turn fully left for dimmest.
- Turn fully right for brightest.
Connection & Activation
When connecting an external TS/TRS footswitch or expression pedal, the LED indicator will flash red. Trigger the footswitch or pedal repeatedly during this state.
Once the connection is successfully recognized, the Vein will return to normal operation.
Note: If the External Control is not fully activated, it may result in limited functionality.
External Footswitch Compatibility
When connecting an external TS/TRS footswitch, there are two specific functional settings, depending on the color of the LED indicator:
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LED White - The current footswitch-specific function is Freeze/Infinite.
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TS Footswitch : Momentary triggers Glide.
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TRS Footswitch:
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Tip Position: Momentary triggers Ramp.
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Ring Position: Momentary triggers Glide.
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LED Orange - The current footswitch-specific function is Ramp
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TS/RS Footswitch: Momentary triggers Ramp.
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TRS Footswitch:
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Tip Position: Momentary triggers Ramp.
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Ring Position: Momentary triggers Glide.
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Expression Pedal Compatibility
When an expression pedal is connected, it takes direct control over the Ramp by blending between the Panel-Set and Snap-Set. In this mode:
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The Ramp ATK and Ramp RLS parameters are disabled.
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Ramp cannot be triggered by Press&Hold the footswitch.
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The expression pedal locks Vein into LED White (Tap Tempo active), and mode switching to LED Orange (Ramp active) is disabled.
How do I update my Klowra pedal?
1/ Download the latest firmware update file for your model from the relevant model page.
2/ Connect the Klowra pedal to your computer using the USB-C data cable.
3/ Hold down footswitch&the LED button while powering on, the LED flashing red.
4/ Open the firmware update file. Please avoid opening multiple installers at the same time, as this may cause detection issues. Click Update to begin installing the firmware.
5/ After the successful update, the LED turns off. Restart the pedal and enjoy!
STILL UNABLE TO CONNECT KLOWRA PEDAL?
If reconnecting the pedal or restarting the software doesn't help, check the following:
1. Verify that the USB data cable is securely connected to both the pedal and your computer, and try using a different USB port if necessary.
2. Replace the USB data cable with a known-good one and attempt to reconnect the pedal.
IF THE PROBLEM CONTINUES, PLEASE FOLLOW THESE STEPS:
1. Close the update software, and then follow the steps below in order.
2. Connect your klowra pedal to your computer with a USB data cable (not included).
3. Relaunch the update software.
4. Power on the pedal while holding both the footswitch and the LED button.
5. The LED button wil flash red. Wait a moment, then click "Update" to begin the firmware process.
Inputs | 2 x 1/4"TS Instrument jacks |
Input Impedance | 500k Ohm |
A/D & D/A | 24 Bit 44.1K Hz |
Power Source | 9V DC power supply required |
External Control | TS/TRS Momentary footswitch, or TRS expression pedal |
Hardware Interface | USB-C |
Outputs | 2 x 1/4"TS Instrument jacks |
Output Impedance | 100 Ohm |
Max Input Level | +10 dBu |
Current Draw | 250mA |
Bypass Mode | Switchable: True Bypass, Buffered Bypass(AnalogDry-Through) |
Dimensions | 54.7mm H x 124.8mm D x 69.2mm W(2.0"H x 4.9"D x 2.7"W) |