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Donner
Donner Digital Octave Guitar Effect Pedal Harmonic Square

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Donner Digital Octave Guitar Effect Pedal Harmonic Square

$45.99 to $130.99 Price Tier: Budget

2 Critic Reviews

Walmart

0 wishlisted

7 saved

Page last updated Jun 18, 2026

Pricing and availability

We compare 600+ stores and found this item at 2 stores. Prices updated January 14, 2026.

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Price

$130.99

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Walmart

$45.99

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Average Price: $88

Budget/Beginner

$100

$301+

Price Tier

In the Harmonizer & Octave Effects Pedals category, Donner Digital Octave Guitar Effect Pedal Harmonic Square is priced in the Budget/Beginner range. This is great gear to get started with or for creators on a budget.

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Description

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Unleash your creativity with the Donner Digital Octave Guitar Effect Pedal Harmonic Square, your ultimate companion for exploring dynamic soundscapes. This compact yet powerful tool is designed for the adventurous guitarist seeking to expand their sonic horizons. With 7 shift types and 3 tone mode toggles, this pedal offers an impressive palette of 21 semitonal, octave, and detune sound options, making it a versatile addition to any pedalboard.

Dive into the world of diverse tonal possibilities with its three distinct tone modes: Sharp for pitch-up effects, Detune for that subtle, adjustable pitch-shifted feel, and Flat for pitch-down experiences. The dual knob control system, featuring WET and DRY knobs, provides easy and precise sound customization, allowing you to dial in the perfect mix of harmonic and dry signals.

Crafted from durable Aluminium-alloy, the Harmonic Square ensures reliability and longevity on the road or in the studio. Its true bypass design guarantees a transparent tone, preserving your instrument's original sound when the effect is disengaged. Despite its robust build, the pedal remains incredibly portable, making it a seamless fit for any setup.

Key Features:

7 shift types and 3 tone mode toggles for 21 sound options
Tone modes: Sharp, Detune, and Flat
Dual knob control for WET and DRY signal levels
Durable Aluminium-alloy construction
True bypass design for transparent tone
Compact and portable design for easy pedalboard integration
Operates on a DC 9V adapter power supply (not included) with a working current of 110mA

Videos

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Greg Kocis

Donner Digital Octave Guitar Effect Pedal Harmonic Square 7 modes

Greg Kocis

Reviews

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Critic Reviews

Donner Harmonic Square Pitch Shifter Pedal Review * Ashley J. Saunders

ashleyjsaunders.com

The Donner Harmonic Square Octave Guitar Effect Pedal delivers impressive sound versatility in a compact design, seamlessly shifting pitches with minimal tracking issues. Its robust build quality earns high marks, and the control layout, while initially confusing, becomes intuitive with use. However, it struggles with lower notes when set to down two octaves, which may disappoint bassists. Despite this minor flaw, its affordable price and excellent tonal options make it a worthwhile addition for guitarists seeking new sounds without sacrificing pedalboard real estate.

positive

Full Review

Change My Pitch Up: The Donner Harmonic Square Octave Pedal - Guitar Girl Magazine

guitargirlmag.com

The Donner Harmonic Square Octave Pedal delivers an impressive array of tones packed into a compact design, featuring seven shift types and three tone modes. This pedal is versatile enough for both studio and live settings, allowing guitarists to explore unique soundscapes without sounding artificial. While the lower octaves shine, higher settings can be hit-or-miss, and the lack of a power supply is a notable drawback. However, at around $50, its value is hard to beat for musicians looking to enhance their tonal palette.

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Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Folk, World, & Country

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Pricing and availability

Description

Videos

Reviews

Critic Reviews

Donner Harmonic Square Pitch Shifter Pedal Review * Ashley J. Saunders

Change My Pitch Up: The Donner Harmonic Square Octave Pedal - Guitar Girl Magazine

Genre Usage

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