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Donner Digital Octave Guitar Effect Pedal Harmonic Square 7 modes
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- 7 modes effect and 3 way toggle switch select between different modes.
- Digital circuit design, true bypass provide transparent tone
- Whole Aluminium-alloy classic, stable and strong
- LED indicator shows the working state.
- DC 9V Adapter power supply.(not included)
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Harmonic Square Features
- Power Supply：DC 9V(Negative in the center).
- Toggle switch: Select between different modes.
- WET Knob：Control the harmonic signal level.
- DRY Knob：Control the dry signal level.
- Modes Knob：For selecting the types of effects.
- Input & Output Jack：1/4’’ mono audio jack.
- LED Light：LED indicator shows the working state.
- Full metal shell：Aluminum-alloy classic, stable and strong.
- True Bypass：True bypass for zero tone coloration.
Good Octave Tone | Easy to Control | Classic Design
This is a wonderful pedal. Digital circuit design, and variety of octave effect adds musical color to you tone. 7 different modes: ±2 semitones, ±3 semitones, ±4 semitones, ±5 semitones, ±7 semitones, ±12 semitones, ±24 semitones, LED indicator shows the working state
There are two function knobs, namely WET and DRY. 3 way toggle switch select between different modes. 7-Mode octave effects you can choose. Control two function knobs and choose different model you want to made you own music tone. Enjoy your own fun and colorful life.
As you can see, Harmonic Square have a novel design logo, classic mini size, convenient and durable. True bypass switch lets your instrument’s signal pass through a non-electronic bypass line when the effect is disengaged, feeding your amp with direct, unaltered signal from your instrument
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I am not doing any preforming or even recording, just working off stress with an acoustic/electric Ovation, Fender Acoustic Amp, TC Ditto Looper and this octave/detuner/harmonizer pedal.
The pedal can change the pitch of a note by 2, 3, 4, 5, 7, 12 or 24 half-steps up or down. It can also detune by increments of partial steps. Separate pots allow blending of the processed (wet) and unprocessed (dry) signals.
There are combinations of switches, dials and volumes that make weird noises but here are, for me, the most useful settings when coupled with a standard 6-string guitar:
Bass Guitar: Selecting “Flat” on the switch, "1 Oct" on the dial, and turn the Dry volume down to zero.
8-String Bass: Same as bass guitar but add some Dry volume.
12-String Guitar (mostly): Sharp, "1 Oct", and Balanced Wet and Dry volumes. This isn’t quite a 12-string because a real 12-string duplicates the B and high E strings where this box increases these strings by an octave too. The EADG strings are like a 12-string.
Lead Guitar: Detune on the switch, “±5” on the dial and a blend of wet and dry volumes. This makes a nice thick note.
Lyricon: Sharp, "2 Oct", Dry volume to zero. Wyndham Hill’s Chuck Greenberg used to play a very high-pitched woodwind instrument called a Lyricon. The Donner does a good job of copying this sound with these settings. When played from an acoustic the live sound may drown out the output of the Donner but when looped or recorded it sounds great to me.
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.
Top international reviews
A simple toggle switch allows the user to change between the sharp, detuned and flat settings. The central dial switches between the 7 available modes: plus or minus 2, 3, 4, 5 and 7 semitones and 1 or 2 octaves. The Wet and Dry knobs allow you to adjust the amount of effect required. There is no mystery here, play with the pedal for half an hour and you’re sure to have found a range of sounds to suit your style.
I’ve been combining the Pitch Shifter with Donner’s Blues Drive and am achieving some amazing results, especially when using the Detune and Flat settings. You want to sound like some of 60s and 70s guitar gods? Invest in this robust little beauty and you’ll be halfway there!
Just one thing to bear in mind, if you want to mount this or any of the Donner mini pedals on a pedal board using Velcro, remember to remove the rubber pad from the underside of the pedal - you won't get Velcro to stick the rubber foot.
Build quality is excellent, made of metal with a nice finish. The different sounds I can get out of this thing are unreal! It really does sound like an organ at times!
You can adjust the amount of wet and dry signal you want and the pitch shift effortlessly with two knobs and a switch. I can see this being really handy when I want to play along with a recording which is in a different key but I don't want to detune!
I have found this adds a nice flavour to my tone and helps to fill it out a bit when I'm just playing in my bedroom. It tracks nicely and there isn't a massive lag that I have noticed.
Size wise it's a micro pedal so doesn't take up loads of space on my board. It's about half the size of a standard sized boss pedal. It doesn't take batteries so needs a 9v input but this keeps its size and weight down which I'm all for.
All on all this is a great piece of kit at a really affordable price when compared against other manufacturers. I can't justify paying a premium when this is solidly built and does exactly what it says it will. With the money I saved I will definately be buying more donner products to add to those I've already bought. Never been dissapointed yet with them!
Build wise, as with all Donner pedals, it's pleasingly tank like and good weight with a sturdy metal shell.
You get three options courtesy of a toggle switch "Sharp, Flat, Detune". The detune will be interesting to those who favour a wackier sound. I prefer the Sharp mode which lets you double your initial note up to two octaves higher. You can quite a nice 12-string effect from this setting.
You can also control the "wet" and "dry" settings so you can dictate how much of the effect you want coming through.
I've made a video and looped the same short phrase through each of the effect settings so you can hear them all.
One thing to point out that I've seen asked is that you cannot detune (so drop half a tone to play along with G'n'R for example), this will NOT do that, it is purely a pitch shifter that will double up your original note to the selected interval.
Another solid and great value pedal from Donner!
- Low octave to create bass lines
- Change the mix of wet/dry signal to thicken the sound, or just use an alternate tuning.
- Add harmonies e.g. 5th
- higher pitches to create synth-like sound
- use the detune function and it's now a chorus pedal!!
For this price it's really incredible value, and all metal so it looks very sturdy. I'm having a lot of fun exploring this pedal and all the sounds I can get out of it. Really great product.
- Incredibly versatile, it has 7 modes and then you have 3 modes of adjustment within that (sharp, detune and flat), along with separate wet and dry blends.
- It takes up limited space on your pedalboard
- It doesn't take batteries so it is better for the environment!!
- Absolutely none
The sounds available from this pedal are amazing! I was so blown away that I instantaneously replaced a much higher priced pedal from a reputable brand on of my new gigging pedalboards for 2020! Donner have definitely got this right!
Straight away, the Harmonic Square feels like pure quality, very rugged chassis and the controls are very intuitive. Thank you Donner for making this, it's bloody brilliant!
I think this reflects Donner; you get what you pay for.