(B-Stock) UM-ONE MIDI Interface MK2

B-stock information

Warranty: This product comes with a 3-year warranty.
Complete: Yes
Original packaging: In good condition
Condition of product: Traces of use (no damage/scratches)

What is a B-stock product?

A product becomes B-stock when it can no longer be sold as new. It can simply be a product that has been returned by a customer or it may have packaging that is damaged or missing. It’s possible that the product itself may show slight signs of use or damage too. All B-stock products are fully checked to ensure that they work properly and you can find details of why the product is a B-stock in the information above.

B-stock information

The B-stock tab on the product page shows information about the B-stock product. Be aware that this information supersedes anything you may read in the product description. The product description includes text and specifications about the product in its brand-new state. It’s possible that a B-stock item may be missing accessories mentioned in the text or specifications, for instance, but if so, this will always be mentioned in the B-stock information. B-stock products also include photos of the actual B-stock item so that you can see exactly what it looks like.

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Photo of the brand new product
Photo of the B-stock product with packaging (if included) and any accessories
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Original packaging

Packaging in good condition: undamaged (sticky tape residue may be visible)
Packaging damaged: box has dents, tears and/or holes
Packaging missing: replaced with a Bax Music box

State of product:

New: the product itself is new, but the packaging may not look new
Signs of use (no damage or scratches): smudges, fingerprints and/or dust
Scratches/damage: product has scratches and/or damage

Can I return a B-stock product?

Yes! Our 30-Day Trial Period also applies to B-stock products.

Do B-stock products come with a warranty?

Yes! Our usual Bax Music warranty also applies to most B-stock products.

Product information

Product no: 5000-0027-7931

General

Roland's UM-ONE mk2 USB MIDI interface has MIDI inputs and outputs and a powerful FPT processor. It's extremely compact and easy to use and the integrated FTP processor ensures minimal latency. This interface is compatible with Mac and Windows and you can use it with iOS devices such as the iPad. For the latter, you will need the Camera Connection Kit, which is sold separately. The simple, yet powerful interface is small in size and very comprehensive. It comes with all the necessary cables, so it's simply a matter of plug-and-play. Connect it to your computer, install the drivers and you're good to go! The interface is easy to use and powered by USB for optimal user-friendliness!

Tips or comments about this product

Please note: to connect this interface to your iPod, you will need the Apple Camera Connection Kit, which is sold separately.
This device is compatible with, among others, Windows 8.1 and OS X Mavericks. Download the latest drivers here.

Service promise

Bax Music Warranty This product comes with a 3-year warranty.

This product comes with a 3-year warranty.

Reviews (61)

4.6

61 reviews

Rating

5 stars 48 4 stars 8 3 stars 1 2 stars 3 1 star 1

Write a review

5 / 5

Roland UM-ONE MIDI Interface MK2

Perfect, just what I needed to connect my Yamaha SY55 to my Desktop PC.

The SY55 only has Midi 5 pin Din connections, so needed this to connect this to the PCs USB port, this apparently only works on USB2 which wasn't a problem for me.

However I did have to get the latest driver (for Win 10 64 bit) from the Roland website, shame there wasn't a sticker on the box directing the purchaser of this product to the correct download required, anyway downloaded /installed and it works perfectly.

December 16, 2020 | Sulzer47

5 / 5

Roland UM-ONE MIDI Interface MK2

This is not a particularly cheap interface cable but the quality certainly justifies that. (I originally tried a much cheaper version of this type of cable but it didn't work so, lesson learned... don't skimp on quality gear).

Once the driver software had been installed, the Roland UM-One MIDI Interface MkII worked without problems allowing me to connect and edit the programme settings of my old Zoom b9.1ut MultiFX pedal.

I'm very happy with it.

April 17, 2020 | Dogbass

5 / 5

Roland UM-ONE MIDI Interface MK2

The product works fine with my yamaha electric piano. The only criticism I have is that the disc supplied with it was out of date. When I put it into my macbook proI got the message that my operating system was not supported. I went onto the Roland site to download the drivers and that worked fine. Gained a coaster though, which is what I will use the disc for!

May 10, 2016 | Elaine S.

Reviews from other countries

5 / 5

Roland UM-ONE MIDI Interface MK2

Très bon produit
Un peu de latence si on installe pas le software. Petit switch sur le côté pour choisir de le faire ou non.

October 9, 2026 | Fabian Facchi

This review was automatically translated from French.

5 / 5

Roland UM-ONE MIDI Interface MK2

Ideal for completely removing USB ground loop / electrical noise from audio sources (such as synthesizers in my case) by converting 2-way MIDI communication from USB to 5-pin.
Lifesaver in any high-end studio setup that depends on zero-latency MIDI from / to external hardware, while maintaining crystal-clear audio transparency is crucial!

March 27, 2026 | Kostas Maskalides