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KORG

Korg Monotron Duo Analogue Ribbon Synthesizer

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$69.99

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Ships from Rapid City, SD. Free on orders over $100.

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Trusted by players nationwide since 1963.

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This brand new Korg Monotron Duo Analogue Ribbon Synthesizer with a full factory warranty can be seen in our Rapid City, SD showroom.

Buy risk free with our 14 day - full refund, less shipping, return policy. Check out our shop policies for more details.


Go Anywhere Analog: That was the theme behind the remarkable battery-powered and palm-sized analog synthesizer that Korg dubbed the monotron. Now the powerful and fun-to-play monotron is joined by two new siblings. Each is played from a ribbon controller keyboard with newly added features. The monotron’s simple operation and ease of use (5 knobs and 1 switch) is alive and well, inviting hours of enjoyment and musical exploration.

Offering two oscillators, the monotron DUO adds an extra dimension, delivering an even more extreme sound. Tune the oscillators in unison for a rich, thick, analog tone. Tune them in intervals for classic soloing sounds and generating new effects. The X-MOD (cross modulation) circuit taken from Korg's classic Mono/Poly can introduce a mild or razor-sharp edge to the overall sound; everything from a rich vibrato to extreme metallic sounds reminiscent of an FM synth.

The monotron DUO's ribbon controller keyboard now features the familiar Scale function used on the KAOSSILATOR. You can use this button to select one of four scales: Chromatic, Major, Minor, or Off. Choose the Chromatic scale to play precise pitches as on a piano, or choose Major or Minor to generate musically coherent phrases by simply sliding your finger around on the keyboard.

The distinctive tone of an analog filter (VCF) can dramatically alter and enrich the sound. The monotron DUO uses the same highly acclaimed VCF circuit as KORG's classic MS-10 and MS-20 semi modular synthesizers. Originally released over 30 years ago, these instruments are still coveted today for their aggressive, dynamic filters. The VCF Cutoff knob sets the frequency or tone of the filter; the VCF Peak knob adds emphasis. A powerful filter is an essential aspect of any analog synthesizer, applying dramatic tonal changes to the sound, and projecting an intense personality that will stand out in any live performance.

The input jack (AUX input) built into the monotron DUO’s compact body allow you to place any audio source into the monotron DUO’s signal path, directly before the analog filter. This provides a great way to connect a KAOSSILATOR, a guitar, or a digital audio player to the monotron and enjoy tone-bending filter effects

A miniature speaker is built into the monotron DUO. Along with the battery operation and compact size, this feature allows you to enjoy the share the monotron DUO’s analog synthesis sound with your friends, anywhere, at any time. There's also a headphone output that you can use when practicing in private, creating sounds at home, recording, or for connecting to an amplifier or PA system.

Synthesizer structure
2 VCOs with X-Mod; 1 VCF
Switches
Standby / VCO1 / VCO1+2, Scale Select Button: (Chromatic -> Major -> Minor -> Off)
Knobs
VCO1 Pitch, X-MOD Int., VCO2 Pitch, VCF Cutoff, VCF Peak
Controller
Ribbon Controller
Volume
Headphone Volume
Speaker
Miniature Internal; Disabled when headphones are in use
Power Supply
AAA batteries (x2), recommended alkaline batteries
Battery Life
Approximately 8 hours (with alkaline batteries)
Dimensions
(W x D x H)
120 mm x 72 mm x 28 mm / 4.72” x 2.83” x 1.10”
Weight
95g / 3.35 oz. (without batteries)
Accessories
AAA batteries x2 (for verifying operation)
MONOTRONDUO

Customer reviews

11,000+ Five-Star Reviews On Reverb

What players say after the guitar arrives

“The guitar was well packed and is set up to my liking! I would definitely do business with this company again!”

Gerald K. – Jun 4th, 2026Reverb
Gibson ES-330

“This is a beautiful guitar…appreciate the free setup and quick ship! Would purchase from this seller again…THANKS!”

Guitar D. – Jun 4th, 2026Reverb
Yamaha RSS02T

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Eddie R. – Jun 4th, 2026Reverb
Epiphone 1957 SJ-200

“Very fast shipping, arrived in perfect condition, extremely well set up, no adjustments needed at all! Plays and looks great, exactly as advertised.”

Duncan K. – Jun 3rd, 2026Reverb
PRS SE CE 24

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Frequently Asked Questions

Do you set up every guitar before it ships?

Yes. Every guitar that leaves our store has been professionally inspected, set up, and signed off by the technician who worked on it. You will find a signed checklist inside the box when your order arrives.

How accurate are your condition descriptions?

We treat condition grading as a contractual promise, not an approximation. When we list something as excellent, that reflects a specific, consistent standard we apply across every instrument. We encourage you to call us before purchasing if you want a detailed in-hand description of any specific guitar.

Can I call and speak to someone about a guitar before I buy?

Yes, and we encourage it. Our team are working musicians, not order-takers. Call us at 605-348-6737 and ask about any instrument in our inventory. We will physically pull it off the wall and describe it to you in detail.

What is your return policy?

We offer a 14-day return policy if you change your mind and the item is returned undamaged. You are responsible for return shipping costs.

Do you offer financing?

Yes. Financing options are available at checkout. Monthly payment options are designed to make high-ticket purchases more accessible without requiring full payment upfront.

How do you ship instruments?

Every instrument ships fully insured from our store in Rapid City, South Dakota. We offer free shipping on all website orders over $100. Guitars are packaged to survive transit, properly cased, braced, and protected.

Are you an authorized dealer?

Yes. We are an authorized dealer for Taylor, Martin, Gibson, Fender, and many other brands. We are currently the number one independent Taylor Guitars dealer in the world, an award we have received two years running for 2024 and 2025. We are also a Top 10 premium dealer for Martin, Gibson, and Fender.

Do you sell on Reverb and Amazon as well as your own site?

Yes. We are one of the top 15 resellers globally on Reverb, where we have accumulated over 11,000 five-star reviews. We are also one of the only independent premium dealers in the world authorized to sell Taylor and Martin on Amazon.

How long have you been in business?

Haggerty's Music has been open since 1963. Our store is located at 515 Mount Rushmore Road, Rapid City, South Dakota.

Do you offer instrument repair?

Yes. Our certified technicians handle everything from routine setups to full restorations across fretted, orchestral, and band instruments. Our team holds certifications from Taylor Guitars, Yamaha, and other leading brands. Learn more HERE.

What brands do you carry?

Our core guitar brands include Taylor, Martin, Gibson, Fender, PRS, Epiphone, Suhr, Eastman, Gretsch, Luxxtone, Novo, Jackson, Charvel, Legator, and Yamaha among others. These are also the most searched brands on our site, so each has a dedicated collection page.

Do you offer music lessons?

Yes. We offer music lessons. You can find out more HERE.