Roland
Roland UM-ONE Mk2 USB MIDI Interface
Bottom line: The Roland UM-ONE Mk2 USB MIDI Interface ($46.99 on Amazon as of 2026-10-06): FPT processing targets low latency and tighter MIDI clock timing; main trade-off: only 1-in/1-out; multi-synth rigs need several units or a hub.
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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ FPT processing targets low latency and tighter MIDI clock timing
- ✓ USB bus-powered, no wall adapter or extra cable to carry
- ✓ USB and MIDI cables integrated into the unit, nothing to lose
- ✓ Separate MIDI in and out data LEDs make signal-flow troubleshooting fast
Cons
- ✗ Only 1-in/1-out; multi-synth rigs need several units or a hub
- ✗ iPad use requires a separately purchased Apple Camera Connection Kit
- ✗ Fixed captive cables cannot be swapped for longer runs
- ✗ No MIDI thru port for chaining downstream gear
Manufacturer description
The Roland UM-ONE mk2 is a 1-in/1-out USB MIDI interface built by the company that pioneered the PC MIDI interface, and it stays deliberately narrow in scope: get MIDI data between your gear and your computer with tight timing. Roland's FPT processing handles the transfer, which is what the design targets for low latency and steadier clock timing when you are slaving a drum machine or sequencing an external synth. The USB and MIDI cables are integrated into the unit itself, so there is no breakout box and no separate power brick to pack; the interface runs on USB bus power alone. Input and…
SpecPicks Verdict
SpecPicks scored Roland UM-ONE Mk2 USB MIDI Interface using a rating × review-volume × price-fit model applied to published specs and reviews across the audio & midi category. Roland's audio & midi lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for audio & midi of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Does the Roland UM-ONE mk2 work with an iPad?
Yes. Roland lists iOS iPad compatibility, but it requires the Apple iPad Camera Connection Kit, which is sold separately.
Do I need to install a driver on Mac or Windows?
The UM-ONE mk2 is listed as Mac and Windows compatible and is USB bus-powered. Check Roland's support page for the current driver for your specific OS version.
How many synths can I connect at once?
One in and one out, so one device each direction. To sequence multiple synths from one port you would add a MIDI thru box or a second interface.
Does it need a separate power supply?
No. It runs entirely on USB bus power from the connected computer or tablet, so there is no wall adapter in the box.
Is the UM-ONE mk2 reliable for vintage gear?
It uses standard 5-pin DIN MIDI, the same connector used on classic synths and drum machines.
Key Features
- One-in/one-out MIDI interface with high-performance FPT processing
- Compatible with Mac and Windows operating systems, and now with iOS on the iPad via the Apple iPad Camera Connection Kit
- Data indicators for both MIDI input and output
- Conveniently integrated USB and MIDI cables
- USB bus-powered operation
- Super compact, affordable, and easy to use
Full Specifications
| Brand | Roland |
|---|---|
| Unit Count | 1 Count |
| Audio Input | USB |
| Connectivity | USB |
| Model Number | UM-ONEMK2B |
| Compatibility | iOS, Mac |
| Item Type Name | UM-ONE-MK2 One in Two Out Midi Cable (UM-ONE-MK2) |
| Compatible Devices | Midi Devices |
| Number of Channels | 1 |
| Supported Software | ['Mac, Windows and iOS'] |
| Included Components | Owner's Manual |
| Maximum Sample Rate | 48 KHz |
| Warranty Description | Consumer limited warranty: 1 year parts, 90 days labor. |
| Connectivity Technology | MIDI |
| Manufacturer Part Number | UM-ONE-MK2 |
| Item Dimensions D x W x H | 1.2"D x 2.4"W x 0.6"H |
| Global Trade Identification Number | 00761294503829, 04957054503826 |
Ready to buy?
Roland UM-ONE Mk2 USB MIDI Interface is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
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