Updated · Researched and written by Elan Harpaz · How we pick
For most people the best midi interface is the CME U6MIDI Pro, $49.99 when we checked it on 2026-10-19. Two or three pieces of MIDI gear that need to route to each other, not just to a computer.
Researched, not tested: we have not handled these products. Verdicts come from published specs, owner reviews read at volume, and our own weekly price record. No paid placements, and commissions never change our rankings.
A MIDI interface has one job: get 5-pin MIDI hardware talking to a computer, or to other MIDI hardware, without adding lag or dropouts. The three picks here sit on a straight port-count ladder, from one cable in and out, to three ports with routing, to a four-port network hub built for a whole studio.
There is no single dominant Reddit thread behind this pick set. It comes from the manufacturers' own specs, Amazon owner-review counts and ratings as of August 2026, and where each product sits on mid1's price ladder for the category. What separated the picks:
Best for: Two or three pieces of MIDI gear that need to route to each other, not just to a computer.
3 in / 3 out of 5-pin routing over a single USB-C port, with split, thru, merge and filtering configured in free software.
$49.99 observed
Check price on AmazonThe CME U6MIDI Pro is the default pick. Most home studios land on two or three pieces of MIDI gear sooner or later, a keyboard plus a drum machine or a second controller, and the U6MIDI Pro is the cheapest box that routes between them instead of just passing one cable through. 3 in / 3 out over a single USB-C port covers that rig with room to grow into it.
The Roland UM-ONE Mk2 is the right call for one instrument and nothing else, a simple one-cable interface that does the one job it has cleanly. The iConnectivity mioXM is for a studio built around routing itself, several synths, a couple of computers, maybe a stage rig, where the Ethernet networking and four USB host ports earn their price. For a lighter routing job than the mioXM but heavier than a single cable, the iConnectivity mio in our catalog covers one USB-MIDI connection at a lower price than either the UM-ONE or the U6MIDI Pro, and the CME WIDI Master, CME WIDI Jack and Yamaha UD-BT01 cover the wireless route for anyone who wants to lose the cable rather than add a router. The Kenton THRU-5 is worth knowing about too, a dedicated 1-in, 5-thru box for anyone who needs to fan one clock or controller out to a rack of synths rather than route between a handful of them.
Basis: no single dominant Reddit thread drove this pick set. Specs are the manufacturers' own, owner review counts and star ratings are pulled from Amazon as of August 2026, and picks are placed on the price ladder from budget to premium. Ratings score each interface on the merits with price left out, so the premium pick sits highest and the tier label only tells you where it sits on price. We track listings and prices; we have not hands-on tested these.
Start with how many pieces of MIDI gear need to reach the computer, then work outward.
Buy for the number of ports you will actually fill, not the number printed on the biggest box.
A 1 in / 1 out USB MIDI cable interface with Roland's FPT processing for low latency and tight clock timing.
$46.99 observed
Check price on Amazon
3 in / 3 out of 5-pin routing over a single USB-C port, with split, thru, merge and filtering configured in free software.
$49.99 observed
Check price on Amazon
4 in / 4 out 5-pin DIN plus 4 USB-MIDI host ports and Ethernet RTP-MIDI networking with 12 virtual ports.
$249.00 observed
Check price on Amazon| Pick | Tier | Price, and when observed | Our rating | Best for |
|---|---|---|---|---|
| Roland UM-ONE Mk2 USB MIDI Interface | Budget Pick | $46.99 on 2026-10-19 | 7.8 / 10 | One synth or keyboard that just needs to reach a computer. |
| CME U6MIDI Pro 3-in-3-out MIDI Interface | Best Value | $49.99 on 2026-10-19 | 8.6 / 10 | Two or three pieces of MIDI gear that need to route to each other, not just to a computer. |
| iConnectivity Interface with 4 in x 4 Out 5-pin DIN-MIDI Ports (mioXM) | Premium Pick | $249.00 on 2026-10-19 | 9.1 / 10 | A whole studio's MIDI gear, or a stage rig with several computers and instruments, routed through one hub. |
$46.99
Best for: One synth or keyboard that just needs to reach a computer.
The Roland UM-ONE Mk2 is the one-cable answer to a simple problem: one piece of 5-pin MIDI hardware talking to a computer. Roland has made a version of this same one-cable interface for years, and this is that idea shrunk down to 1 in / 1 out and nothing else.
FPT processing, Roland's low-latency circuitry, keeps clock timing tight enough for a drum machine or arpeggiator locked to a DAW. It runs on USB bus power with no separate adapter, works with Mac, Windows and iPad via Apple's Camera Connection Kit, and the USB and MIDI cables are built into the unit rather than sold apart.
The tradeoff is in the name: one port each way, no merge, no thru, nothing to configure because there is nothing to configure. For a single synth it is the right amount of interface. For a rig with three or four pieces of MIDI gear, it is the first cable you outgrow.
| Ports | 1 in / 1 out |
| Connectivity | USB MIDI cable interface, built-in USB and MIDI cables |
| Compatibility | Mac, Windows, iPad via Apple Camera Connection Kit |
| Power | USB bus powered |
| Processing | FPT for low latency and clock timing |
| Weight | 3.2 ounces |
| Dimensions | 1.2" x 2.4" x 0.6" |
$49.99
Best for: Two or three pieces of MIDI gear that need to route to each other, not just to a computer.
The CME U6MIDI Pro is what you reach for once one MIDI cable stops being enough. It packs 3 in / 3 out of 5-pin routing behind a single USB-C port, built as a standalone router rather than a plain pass-through interface.
Split, thru, merge and filtering are configured through CME's free UxMIDI Tools software for Mac and Windows, and the box passes MPE, sysex, MIDI timecode and clock alongside ordinary notes and controllers, so it holds up behind synths and controllers that lean on those messages. A high-speed optocoupler keeps the signal clean between ports.
The catch is that the configuration lives entirely in software, so there is nothing to see or adjust on the box itself once it is set. Three ports is also a ceiling, fine for a small rig, tight the moment a fourth piece of gear shows up. It has a shorter Amazon track record than the budget pick, with under a thousand reviews so far.
| Ports | 3 in / 3 out, 5-pin DIN |
| Connectivity | Single USB-C port |
| Routing | Standalone router and filter, configured via free UxMIDI Tools software |
| Protocol support | Notes, CC, clock, sysex, MIDI timecode, MPE |
| Compatibility | macOS, iOS, Windows, Android, Linux, Chrome OS |
| Weight | 3.49 ounces |
| Dimensions | 2.56" x 3.29" x 1.32" |
$249.00
Best for: A whole studio's MIDI gear, or a stage rig with several computers and instruments, routed through one hub.
The iConnectivity mioXM is a routing hub for a studio, not an interface for one synth. 4 in / 4 out of 5-pin DIN pairs with 4 USB-MIDI host ports and an Ethernet RTP-MIDI network port, so DIN gear, USB gear and networked computers all land in the same box.
The Ethernet MIDI networking is the real feature: 12 virtual network ports can be assigned across the DIN, USB and networked connections, which gets around the USB cable-length and port-count limits that force smaller interfaces to sit right next to the computer. A capacitive touch panel stores up to four user-definable presets, and class-compliant USB devices need no drivers.
None of that is free. At roughly five times the budget pick's price and 3.4 pounds in a full-size box, it is built for a rig with real routing to do, not a single keyboard. Buying it for one synth means paying for ports that never get used.
| DIN ports | 4 in / 4 out, 5-pin |
| USB host ports | 4, for class-compliant USB-MIDI devices |
| Network | Ethernet RTP-MIDI with 12 virtual network ports |
| Computer connection | USB port, Mac and Windows |
| Controls | Capacitive touch panel, 4 user-definable presets |
| Compatibility | Mac OS X 10.11 or later, PC, iOS via Camera Connection Kit |
| Weight | 3.4 pounds |
No, if the keyboard has USB-MIDI built in, plugging it straight into a computer works without an extra box. A dedicated interface like the Roland UM-ONE Mk2 or CME U6MIDI Pro is for connecting older gear that only has 5-pin DIN ports, or for routing between more than one device.
Thru repeats an incoming signal out to another device unchanged, so a message received on the in port shows up identically on the thru port. Merge combines two separate incoming MIDI streams into a single output, which is what lets two controllers drive one synth from the same cable.
For most performers, yes. Adapters like the CME WIDI Master are rated around 3ms of latency, which is not noticeable while playing, and the tradeoff is freedom from a cable rather than a real drop in reliability. A wired interface is still the safer choice if the connection absolutely cannot fail mid-set.
It means the operating system already recognizes the device without installing a driver, so it works the moment it is plugged in on macOS, Windows, iOS, Android or Linux. All three picks in this guide are class compliant.
Yes. Its four DIN ports, four USB host ports and Ethernet MIDI networking are built for routing between several pieces of gear or across a stage rig. One synth into one computer only needs the Roland UM-ONE Mk2 or a similarly simple single-port interface.
Basically no. Wired 5-pin and USB MIDI interfaces run well under a millisecond of added latency, which is inaudible while playing. Latency only becomes a real factor once Bluetooth MIDI enters the chain.
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