The Vowel is an active volume/classic wah-wah combo pedal features extremely lightweight casing and a small, pedalboard-friendly footprint. 100% analog signal path and selected smooth taper ensures pure signal-thru and precise response.



Please keep this manual in a convenient place for future reference.

Power Supply

Always use a DC 9V center negative AC adapter. Use of an adapter other than that specified could damage the unit or cause malfunction and pose a safety hazard.

Always connect the AC adapter to an AC outlet that supplies the rated voltage required by the adapter.
Disconnect the AC adapter from the AC outlet when during lightning storms or not using the unit for an extended period.


Always turn off the power before connecting or disconnecting. Make sure to disconnect all cables and AC adapter before moving the unit. This will help prevent malfunction and damages.

Environment Considerations

Avoid using the unit in any of the following conditions that could cause malfunction:

  • Extremely hot or cold places
  • Under direct sunlight
  • Magnetic fields
  • Near heaters and other heat sources
  • Sandy or dusty places
  • Places that are extremely humid or exposed to splashing water
  • Places with lots of vibrations

Electrical Interference

Devices that are very susceptible to interference or that emits powerful electromagnetic waves (e.g. radios and TVs) should not be placed near this unit, as interference could occur.
Electromagnetic interference could cause malfunction and could corrupt or destroy data.
Always operate this unit at a suitable distance from these devices.


Do not apply excessive force to the switches and other controls, exposing the unit to strong impacts, which could cause it to break.
Do not put foreign objects or liquids into the unit.
Never open the case or attempt to modify the product in any way since this can result in damage to the unit.
Clean only with a soft, dry cloth.


Volume/Wah Combo Pedal

The Vowel pedal combines active volume pedal and wah-wah pedal in one, providing great convenience for musicians. The unit can switch between two modes by tapping on the top of the pedal (towards toe) strongly.

Active Volume Mode

The Vowel’s Volume mode features active volume design, which is great for preventing signal loss, especially when you’re running your signal through a long signal chain.

Classic Wah Sound

The Vowel’s Wah mode provides you a classic-inspired wah sound with deep filter resonance and smooth sweeping that recreates the iconic 1970s wah pedal sound.

Signal Path

The Vowel features 100% analog circuit design which keeps your sound pristine.

Carefully Selected Components

The Vowel is designed and built with carefully selected components to ensure best sound quality and road performance. The special designed chassis ensures touring reliability


  • Convenient compact size
  • Active volume/wah-wah combo pedal
  • Wah mode providing classic wah sound inspired by the legendary wah
  • pedals
  • Active volume mode for eliminating signal loss
  • Switch between wah and volume modes within a tap
  • Sturdy, lightweight casing


Input Impedance: 1M Ohms
Output Impedance: 100 Ohms
Power Requirement: 9V DC center negative
Current Consumption: 22mA
Dimensions: 148.5mm (D) x 65.5mm (W) x 61mm (H) Weight: 280g

Connection & Controls

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Note: This Owner's Manual is adapted from the official manual created by Donner in PDF format, without modification of the content. We just rewrite the PDF, into responsive mobile friendly pages.So, you can read this document anytime and anywhere.

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