---
product_id: 43752754
title: "Octave Guitar Pedal, Harmonic Square Digital Octave Mini Pedal Pitch Shifter 7 Shift Types 3 Tone Modes Sharp Detune Flat True Bypass"
brand: "donner"
price: "€ 111.50"
currency: EUR
in_stock: true
reviews_count: 8
category: "Donner"
url: https://www.desertcart.sk/products/43752754-octave-guitar-pedal-harmonic-square-digital-octave-mini-pedal-pitch
store_origin: SK
region: Slovakia
---

# Aluminium-alloy build for rock-solid durability True bypass for pristine, uncolored tone 7 shift types + 3 tone modes = 21 sonic combos Octave Guitar Pedal, Harmonic Square Digital Octave Mini Pedal Pitch Shifter 7 Shift Types 3 Tone Modes Sharp Detune Flat True Bypass

**Brand:** donner
**Price:** € 111.50
**Availability:** ✅ In Stock

## Summary

> 🎸 Elevate your soundscape—21 ways to stand out or blend in.

## Quick Answers

- **What is this?** Octave Guitar Pedal, Harmonic Square Digital Octave Mini Pedal Pitch Shifter 7 Shift Types 3 Tone Modes Sharp Detune Flat True Bypass by donner
- **How much does it cost?** € 111.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/43752754-octave-guitar-pedal-harmonic-square-digital-octave-mini-pedal-pitch)

## Best For

- donner enthusiasts

## Why This Product

- Trusted donner brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** Rugged aluminium-alloy chassis ensures your pedal withstands the rigors of touring and studio sessions.
- • **Precision Control:** Fine-tune your sound with dedicated WET and DRY knobs for perfect harmonic balance.
- • **Pure Tone Integrity:** True bypass circuitry guarantees your original guitar tone stays crystal clear when the pedal is off.
- • **Pro-Grade Compatibility:** Powered by a standard 9V DC adapter (500mA, center negative) for seamless integration into any pedalboard.
- • **Versatile Sonic Palette:** Unlock 21 unique pitch and octave effects with 7 shift types and 3 tone modes—sharp, flat, and detune.

## Overview

The Donner Octave Guitar Pedal Harmonic Square is a compact, durable digital pitch shifter offering 7 shift types and 3 tone modes, delivering 21 distinct octave and detune effects. Featuring true bypass for transparent tone, adjustable wet/dry mix controls, and a robust aluminium-alloy build, it’s designed for professional guitarists seeking versatile, high-quality sound shaping in a mini pedal format.

## Description

Buy Donner Octave Guitar Pedal, Harmonic Square Digital Octave Mini Pedal Pitch Shifter 7 Shift Types 3 Tone Modes Sharp Detune Flat True Bypass: Electric Guitar Effects - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Two Harmonic Squares together are AMAZING!!! - So I ended up with 2 Harmonic Square Pedals. Wanting to gift one to a friend, I plugged them both in at the same time, you know... keep the 'good one' hehe. WOW!!!!!! I cannot describe how nice they sound together -running one into another. Used separately they work very well and do what they should (including a killer chorus in the 'detune' setting) but together they sound so rich, deep, full, shimmery and expensive. With both of these on at the same time there is near endless settings just flipping the switch and turning the pitch knob. Easily sounds like a $450 effect. Run these into a tad of reverb/delay and it's absolutely amazing ambient heaven. It could be one of the coolest pedal combo's for shimmer/pitch/chorus/octaving/doubling... SO GLAD I ACCIDENTLY TRIED THIS. So in short, I'm buying my buddy a new one.
Review: Awesome pitch shifter/harmonizer - Fir the price, your getting some crazy good quality. The controls are wicked smooth and the sound, even smoother. Seriously, the sound quality, especially on detune mode is VERY impressive. I hade a lot of fun experimenting with it. Would highly recommend.

## Features

- [Octave/Pitch shifter Pedal] With 7 shift types and 3 tone mode toggles, Harmonic Square guitar pedal gives you 21 options of semitonal, octave and detune sounds
- [3 Tone Modes]: 3 tone modes including Sharp, Flat, and Detune; Sharp: Pitch up; Detune: Adjustable pitch signal shifted by 10 cents; Flat: Pitch down
- [WET and DRY Knobs]: WET Knob: Adjust the harmonic signal level; DRY Knob: Adjust the dry signal level
- [Buit to Last]: Whole Aluminium-alloy classic, stable and strong; LED indicator shows the working state
- [True Bypass ]: Digital circuit design, true bypass provides a transparent tone
- [Kind reminder]: Please power the pedal with a 9V DC adapter (NOT Included), center negative polarity, and a minimum of 500mA current for optimal performance

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B072LG2BZ9 |
| Amperage | 500 Milliamps |
| Audio Output Effects | Pitch-Shifting |
| Best Sellers Rank | #129 in Musical Instruments ( See Top 100 in Musical Instruments ) #3 in Electric Guitar Pitch & Octave Effects |
| Brand | Donner |
| Brand Name | Donner |
| Color | Red Octave |
| Connector Type | 1/4 inch audio |
| Controls Type | Knob |
| Customer Reviews | 4.1 out of 5 stars 1,600 Reviews |
| Hardware Interface | 1/4-inch Audio |
| Item Dimensions | 2.36 x 2.44 x 3.94 inches |
| Item Dimensions L x W x H | 3.7"L x 1.7"W x 2"H |
| Item Type Name | Donner Digital Octave Guitar Effect Pedal Harmonic Square 7 modes |
| Item Weight | 0.25 Kilograms |
| Manufacturer | Donner |
| Manufacturer Part Number | EC966 |
| Model Name | Harmonic Square |
| Model Number | EC966 |
| Power Source | Adapter |
| Product Dimensions | 3.7"L x 1.7"W x 2"H |
| Signal Format | Analog |
| Style | Octave Pedal, Pitch Shifter, Guitar, Bass |
| UPC | 708302989077 708302975964 |
| Unit Count | 1.0 Count |
| Voltage | 9 Volts |
| Warranty Description | 2 year manufacturer. |

## Product Details

- **Brand:** Donner
- **Color:** Red Octave
- **Item Weight:** 0.25 Kilograms
- **Product Dimensions:** 3.7"L x 1.7"W x 2"H
- **Style:** Octave Pedal, Pitch Shifter, Guitar, Bass

## Images

![Octave Guitar Pedal, Harmonic Square Digital Octave Mini Pedal Pitch Shifter 7 Shift Types 3 Tone Modes Sharp Detune Flat True Bypass - Image 1](https://m.media-amazon.com/images/I/71VJr1J6+wL.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Two Harmonic Squares together are AMAZING!!!
*by A***R on November 26, 2025*

So I ended up with 2 Harmonic Square Pedals. Wanting to gift one to a friend, I plugged them both in at the same time, you know... keep the 'good one' hehe. WOW!!!!!! I cannot describe how nice they sound together -running one into another. Used separately they work very well and do what they should (including a killer chorus in the 'detune' setting) but together they sound so rich, deep, full, shimmery and expensive. With both of these on at the same time there is near endless settings just flipping the switch and turning the pitch knob. Easily sounds like a $450 effect. Run these into a tad of reverb/delay and it's absolutely amazing ambient heaven. It could be one of the coolest pedal combo's for shimmer/pitch/chorus/octaving/doubling... SO GLAD I ACCIDENTLY TRIED THIS. So in short, I'm buying my buddy a new one.

### ⭐⭐⭐⭐⭐ Awesome pitch shifter/harmonizer
*by M***X on January 29, 2026*

Fir the price, your getting some crazy good quality. The controls are wicked smooth and the sound, even smoother. Seriously, the sound quality, especially on detune mode is VERY impressive. I hade a lot of fun experimenting with it. Would highly recommend.

### ⭐⭐⭐⭐ Good bass, great chorus
*by M***N on February 4, 2019*

I've been performing with this one for half a year, now, and it has become a fundamental part of my equipment, more so than I expected. I wouldn't even think of going anywhere without it, now. Originally, I got it to fill in bass when the bass guitarist didn't show up. Now, I use it mainly for chorus, which it does quite well. Here's a breakdown of the functions, and how I see them: The +/-2,3,4,5 functions are gimmicks. Unless you're playing an avant garde piece over a chromatic scale, this will never work. Having a harmony tone exactly one set number of steps from the played note can't follow any particular scale, so it's a recipe for failure. This is not a product defect. It's just a fact of music theory. The sharp function may be another matter. My thought was that moving the pitch in whole octaves should be fail-safe. If the note you play is correct, then one octave removed should also be correct. Setting it to -1 octave (flat) works nicely. Setting it to -2 octave (flat) works well enough, but it's too low to be practical, unless I'm riffing on the high E, which I never do for an entire song, so I don't use it. Incidentally, flatting the note means having to play differently, also. -1 flat octave works great with power chords, making them more menacing, especially with all-neck pickups and high distortion, and it also works well for imitating a bass guitar or doing a solo resembling a twelve-string guitar. However, it means needing to play more simply, because it doubles the likelihood of muddiness. However, while the flat octave functions work as expected, the sharp octaves bite the dust. Single notes sound like comic effects, like a drunk duck that inhales helium. They're also delayed a fraction of a second. If an entire chord is strummed with a +1 sharp octave setting it sounds somewhat like a pipe organ, and actually can do a pretty good imitation of phantom of the opera. This, probably, could be listed as an item of bad design, but I didn't get it for this function, so I don't care too much. Lastly, but not least, the detune function gives three different intensities of chorus, described as +10 cents through +30 cents detune in the clockwise direction, and their negative counterparts in the counter-clockwise direction. For the record, detune means the same thing as chorus. Also, the negative versions sound exactly like the positive versions to the human ear. Of these settings, only the most subtle sounds good. In fact, it sounds great. I love it. The other two get a little weird. A power chord on the mild detune sounds richer and fuller. Dirty signal gets the edge smoothed off of it a little, making it more palatable to the average (non-heavy metal) ear. It shimmers well. So, the short of it is that most of the functions are junk, but it has two great features that redeem it. It's not like I want to be crouching down and changing the settings during a performance, so all I really need is one great setting that I can leave it on, and punch it on or off at will. I'm quite happy with it. I only dock one star because I feel that the octave sharp function really could have worked better.

## Frequently Bought Together

- Donner Octave Guitar Pedal, Harmonic Square Digital Octave Mini Pedal Pitch Shifter 7 Shift Types 3 Tone Modes Sharp Detune Flat True Bypass
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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-22*