can you use this with a bass guitar?

Yep. Using it with mine and it tracks fine

Anyone know what is the correct adaptor for this? Is it available from Amazon?

Any standard 9v, centre negative adaptor will work e.g. Boss, ehx etc. This is the most common pedal adaptor and a huge range exists on Amazon. One I use which is reliable is the boss 9v, 500ma. This has enough current output to be able to daisy chain a few pedals from the adaptor

Could this double up as reverb or is it strictly delay?

You could set it for a really short rate for that 'slap back' 50's tone or to thicken your normal tone similar to a reverb pedal I guess but it is way more versatile than that. I bought mine 'cos I wanted to capture a tone similar to Slash on 'Welcome to the Jungle' & Dave Gilmour on 'The Wall' primarily & many gear review sites rated it as the best budget Delay pedal out there. For the money it really is unbeatable & I'm really pleased I bought one. You can dial in so many great tones with it.

Are they nearly as good as boss delay?

quality of sound is as good but no as versatile as a good and lot more expensive boss delay pedal. depends what you want... i only wanted something simple as i don’t use delay very much. good for the money!! good luck!

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Donner Octave Guitar Pedal, Harmonic Square Digital Octave Mini Pedal Pitch Shifter 7 Shift Types 3 Tone Modes Sharp Detune Flat, True Bypass

Product ID: 81127023

Details

Brand
Donner
Colour
Octave
Item weight
0.25 Kilograms
Product dimensions
9.4L x 4.3W x
Style
Octave Pedal

🔋True bypass for pure, uncolored tone

🎚️7 shift types for versatile pitch control

🎛️3 tone modes: Sharp, Flat, Detune

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Description

🎸 Elevate your soundscape with Donner’s Harmonic Square — where precision meets power!

SEAMLESS 9 V DC POWER - Optimized for stable performance with standard 9V adapter (not included), no batteries needed.
PRECISION WET DRY MIX - Fine-tune your harmonic and dry signals with dedicated knobs for perfect blend.
TRUE BYPASS TRANSPARENCY - Keep your original tone crystal clear with zero signal loss when pedal is off.
21 UNIQUE PITCH TONE COMBOS - Unlock 7 shift types × 3 tone modes for endless sonic creativity.
COMPACT DURABLE ALUMINIUM BUILD - Mini pedal size fits any board, crafted from sturdy aluminium alloy for road-ready reliability.

The Donner Octave Harmonic Square is a compact, aluminium-alloy digital octave and pitch shifter pedal featuring 7 shift types and 3 tone modes (Sharp, Flat, Detune) for 21 unique sound options. It offers precise wet/dry signal control, true bypass for transparent tone, and requires a 9V DC adapter. Perfect for professional musicians seeking versatile pitch effects in a durable, pedalboard-friendly design.

Specifications

ASIN	B072LG2BZ9
Amperage	500 Milliamps
Audio Output Effects	Pitch-Shifting
Best Sellers Rank	436 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 1 in Delay & Reverb Effects
Brand Name	Donner
Colour	Octave
Connector Type	1/4 inch audio
Controls Type	Knob
Country of Origin	China
Customer Reviews	4.0 4.0 out of 5 stars (1,580)
Hardware Interface	1/4-inch Audio
Included Components	Donner Octave Square Pedal, User Manual
Item Dimensions	6 x 6.2 x 10 centimetres
Item Dimensions L x W x H	9.4L x 4.3W x 5.1H centimetres
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
Number of Items	1
Number of Packs	1
Power Source	DC Power Adapter
Product Warranty	2 years.
Set Name	3 Way 7-Mode Toggle Switch
Signal Format	Digital
Style	Octave Pedal, Pitch Shifter, Guitar, Bass
UPC	708302989077 708302975964
Unit Count	1 count
Voltage	9 Volts

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35810 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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