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Welcome to the world of BluetoothMIDI — Wireless MIDI — BLE MIDI

The Truth About Bluetooth MIDI

Wireless MIDI? What about latency?

Many people (including engineers) who did not try Bluetooth MIDI assume a lot of things about latency with MIDI over Bluetooth.

MIDI is a serial based protocol that has been developed in the early 80s. It is not amazingly fast to begin with.

Bluetooth has been rapidly developing over the last decade. It handles a few megabits per seconds easily.

Therewith it is easy to say that MIDI over Bluetooth is capable of offering a professional low latency solution for musicians and producers. Both on stage and in the studio.

Let me try to address some main ideas.

Bluetooth MIDI is not Bluetooth Audio and does not experience the same latency issues. They are two completely different technologies.

Latency is normal. It occurs in the human hearing and in the communication between an audio interface, computers, midi controllers, monitor speakers, and so on. Everything has latency.

Conversion time is negligible. When is latency really audible by the human hearing? Can your link it directly to a specific part of your system? Or is it a cumulation of parts that are in your system?

A tiny word on MIDI terminology
As you might know, the history of MIDI technology incorporates widely used terms as master and slave. Although the term master is not causing any real issue, the word slave can trigger undesired feelings and emotions to a large group of people.

The black community has done so much for the world of music, it will take an endless amount of articles to describe it. From my perspective, those feelings are valid and must be taken into account.

Especially as I am Dutch…also that is something that is just part of me.

To show at least my gratitude for all that has been done for music by black musicians, I try my utmost best to change the terminology to a more modern form of communication. That is the least I can do.

That is why, with Bluetooth MIDI, we rather speak about central and peripherals. As the previously used terminology trivialise something quite horrendous.

Although, I preferably not mention colour as it does not make any difference to me, I thought, in this case, it would be relevant. I hope this is not offending anyone, as I am quite unexperienced in addressing this.

Read this article for a better understanding. Let’s return to the fun part. Let’s talk about BLE MIDI and of course…..latency!

Latency is just a number…
There are a lot of claims being made about latency and especially the ability of being able to really notice it as a human. Let alone link it to a specific part of your system. There are musicians who play their instruments based upon the limitations of that device. Latency can be just one of them. Therewith it becomes part of the deal.

Of course, latency is an important metric when it comes to music production and performance. Latency for Bluetooth MIDI does not stand upon itself. It depends on the environment and the connected devices.

Also, when you look at your entire system, it is complex for you as a musician or producer to pinpoint latency to a specific part of the system. What I mean to say is how are you able to say the latency you experience from your monitor speakers are caused by either MIDI communications or audio conversions? Or delays in translation by your operating system?

That is why I chose to keep this simple and not get stuck in a number. From my point of view, that number is not a given in every situation and therefore not something one should make its decision on. That would be a false simplification of the wireless technology (opinion).

In the end a proper musician can play with a stable latency. That is why jitter is also a very important metric. Especially when it comes to real time MIDI clock and sync purposes.

The difference between a MIDI cable and BLE MIDI
First of all, with Bluetooth MIDI latency is always a bit higher compared to a regular MIDI cable.

That said, you can question yourself if you would be able to distinguish WIDI Master from a standard MIDI cable in a double blind test. We have noticed that this will always lead to the same discussion about latency.

This discussion is quite similar to the one we have had in the start of streaming and the download days involving MP3s and WAV files. Or that one of the supreme quality of vinyl over anything else….it is ongoing, never ending and also very much part of the process of developing innovating technologies.

Bluetooth MIDI and latency on iOS & Mac
When talking about latency of the WIDI technology you’d have to keep in mind we measure latency by using an oscilloscope. It is measured between two WIDI Masters. The lowest outcome is 3ms. The highest is 10ms. We measure an average on 5ms to 6ms.

The latency on iOS and macOS came from the limitation of the Bluetooth connection interval. This is a rule set by Apple. On iOS it is 11.25ms minimum. On macOS it is 7.5ms minimum.

Please note that these are “intervals” and not “latency” metrics. These intervals can cause latency and jitter due to the limitation of that buffer.

The main reason for this limitation is because Apple has no intention to place Bluetooth MIDI at a high priority compared to other more common services. Thus if you connect any Bluetooth MIDI device with iOS or macOS, you cannot get the connection interval lower than above mentioned limitations.

If we break away from the iOS and macOS Bluetooth connection interval, two WIDI Master can set itself with shortest interval that Bluetooth 5 supported. In this way, we can reduce the latency significantly.

To bypass limitations of iOS and macOS an interesting option is WIDI Uhost. It will also allow you to pair automatically, instead of manually setting your BLE MIDI connection every time..

Make decision based on real life experience..
I consider that you are perfectly capable of making your own decision. If latency is the only metric you make your decision on, and cables work for you, you just stick to your cables. Or at least wait until you and your musician friends can test our Bluetooth MIDI solution in real life at your local dealer. That is fair enough, right?

In the other hand, if you are interested in getting rid of those cables, advanced midi connectivity, app based cable management and wider range plus freedom of movement with midi (like on stage), then Bluetooth MIDI solutions might be of interest for you.

Here are some facts:
With the current BLE MIDI solution as developed with CME’s WIDI it is possible to reduce latency between two WIDI devices using BLE 5 to 3ms. When looking at a stable jitter it is considered that a 4–6ms latency is more accurate.

If you want to find out more about WIDI Master and latency: go read this!

Bluetooth MIDI is the standard as developed by Apple and approved by the MIDI Association already 5 years ago. Many industry icons including engineers from Moog, David Smith, Yamaha, Roland, Korg, Apple, Google, Microsoft etc. worked together to verify this standard.

Learn more: https://www.midi.org/specifications/item/bluetooth-le-midi

There are many professional keyboards and synthesizers already equipped with Bluetooth MIDI features. Tens of thousands professional musicians use it on the stage or in the studio for over several years. If you search on Google, you can find many examples.

For instance: https://www.roland.com/uk/products/ax-edge/specifications/

CME implemented this Bluetooth specific central role MIDI technology in the renowned Xkey Air (2015 www.xkeyair.com) and WIDI BUD (2016 www.widibud.com).

Up until this day CME never received complaints by professional musicians about instability of connections and latency. Therefore MIDI over Bluetooth has already been approved over the time and proven to work by over 4 years of usage.

What is the big challenge?
The real challenge is to convince people and allow them accept the innovation. It might be out of their comfort zone and conflict with everything they know and learned. It takes time.

So if you arrive in a discussion about latency, feel free to forward them to this specific blog to get a better understanding: https://www.cme-pro.com/how-to-connect-two-midi-hardware-via-wireless-bluetooth-midi/

Or forward them to this Facebook group to join the discussion and contribute: https://www.facebook.com/groups/cmeprofans

or — if they really know it all and have years of experience as an engineer — welcome them to join the MMA https://www.midi.org/join-the-mma

Here they can contribute their professional knowledge to allow the entire music industry and all musicians to benefit from it by improving the MIDI standard.

CME WIDI Master VS Yamaha BT-01
Of course CME is not the only company that is into the game of wireless MIDI adapters. Looking more specifically there are others to be found. One of them is the Yamaha BT-01.

The Yamaha BT-01 is a OEM model of the Quicco M1. This means it is exactly the same product, only it carries another brand. When comparing WIDI Master with BT-01 the main difference is that the BT-01 implements Bluetooth 4 (BLE4) compared to WIDI Master implementing BLE 5.

Of course, with the pace consumer technology develops, the difference in performance between BLE 4 and BLE 5 is quite relevant. Leading to lower latency and wider range performance for WIDI Master.

Furthermore BLE 5 will allow the one-to-multiple feature. Something that will be available for WIDI Master after updating the firmware.

Also, Yamaha only implemented Bluetooth Peripheral. Therefore you need a host operating system to function. You would need to use a mobile device or computer to benefit from the wireless capabilities of the MD-BT01

This is one of the unique selling point of WIDI Master. CME’s solution can function fully standalone. Therewith you can pair two vintage synths or your keytar with a keyboard. Without computers.

This is possible because the WIDI Master can fulfil a central role. In Bluetooth terms that means it can switch between the central role and the peripheral role. It can function as a host to any other device.

This means that you now can connect all your MIDI hardware directly to each other. Without a computer. Without cables.

CME WIDI Master VS Roland WM-01
End of September 2020 Roland entered the Bluetooth MIDI adapter world as well when launching its WM-1 and WM-1D. As CME is just a small company, it is great for the wireless MIDI community that industry leaders such as Roland and Yamaha are interested in this niche market.

Looking at the WM-01 compared to the WIDI Master we see the latency performance is quite similar looking at 3ms best case between two adapter devices.

The main difference is that Roland WM-01 has a non-detachable design and is battery powered. Compared to WIDI Master being powered by the MIDI OUT of the device it is attached too and a smart design feature allowing you to detach both connecters. This is especially useful for MIDI devices with only MIDI OUT ports such as many keytars and electronic wind instruments.

Another important difference is the specified range and price. Although Roland is new to the market compared to CME, they report a 10 meters range against 20 meters by CME.

Also, another difference comes in the price where CME’s WIDI Master is US $ 10 to US $20 cheaper than its competitors by Roland.

If you are interested you can find a complete comparison here!

The Power of the Community
The best proof comes from the community itself. If you are interested on how real people use WIDI technology in a wide range of MIDI setups, feel welcome to learn more through these blogs:

Also there are many active community members already making videos of their use case. Watch for instance this one by Defcon Clark taking you into the world of guitar pedals and MIDI. In 3 minutes you see what you can do.

What is next in the world of Bluetooth MIDI?
After the successful introduction of WIDI Master, selling over 15,000 units in the first 6 months, many MIDI enthusiasts requested a more versatile solution for all those neat MIDI devices and the wide variety of MIDI jacks available.

Basically the majority of the request can be divided into two main groups:

  • TRS MIDI solution for guitar pedals, boutique style synths and those slim MIDI controllers.
  • External power option for unpowered MIDI OUT and MIDI IN that are not compatible with WIDI Master 5-PIN MIDI DIN solution.

That is why WIDI Jack was designed. In essence, both WIDI Jack and WIDI Master carry the same WIDI wireless MIDI technology. Therewith the firmware and features are really close related.

WIDI Jack vs WIDI Master
The main difference is that WIDI Jack will allows you to connect TRS 2.5mm MIDI, TRS 3.5mm MIDI and 6-PIN MINI DIN MIDI devices to your wireless MIDI network. To cover an even wider range of applications, you can switch between type A and type B when it concerns TRS MIDI.

Furthermore, WIDI Jack offers an external power solution via USB-C. This way you can add an external power bank to connect with unpowered 5-PIN MIDI ports and even devices with only MIDI IN.

Upon request, we also added a small magnet. This way you can simply stick WIDI Jack on the casing of your device.

Last but not least, another difference that is noticeable is the form factor. As WIDI Master is really an adapter, WIDI Jack is a tiny interface. Its size is only 40% of the volume of your Apple AirPods in the charger casing.

Enter the future of MIDI
The fun part about Bluetooth MIDI is that its development speed goes way beyond what you expect. This is mainly caused by the fact that it is a highly anticipated consumer technology.

Please note that Bluetooth MIDI and Audio over Bluetooth are totally different. The latency is one main point where this difference is made. That said, due to the priority of Audio over Bluetooth for many top tier technology manufacturers, the Bluetooth technology is getting better at a high pace, every day.

As Bluetooth being a technology that is perfectly integrated in today’s mobile devices and operating systems, the fun part is in the user-friendliness from an app or other piece of software you carry around in your pocket.

That is why the firmware of WIDI is constantly improving. This goes hand in hand with an improved app for both Android and iOS.

One Single WIDI device

With WIDI you can pair your MIDI instrument with iOS, MacOS, Win10 (v1909 or higher) and Android (8 or later). With iOS and MacOS Bluetooth MIDI is integrated and you can manually pair with WIDI devices.

With Windows and Android, it will fully depend if your music application runs the Bluetooth MIDI driver. This is not something we can change as developers. The only change will come from you.

The more people will use Bluetooth MIDI, the more likely it becomes that large companies will make it more suitable in its usage by prioritising its development.

It is strongly recommended to look into MIDI bridge apps such as MIDIBerry-IO (Windows) and MIDIMTTR (iOS) when working with mobile devices and operating systems.

Two WIDI devices: Go DAWless. Without computers. Without cables.

Two WIDI devices will pair automatically with each other. They will function without a host. This means you can simply power them up, and they will find each other and pair. You will be up and running in no-time.

With the latest WIDI firmware (v0098 and up) and WIDI App (v1.2.XX and up), you can set your personal preferences.

For instance you can optimise your setup for latency performance. Or go for optimal jitter performance. It completely depends on your use case.

Furthermore, you can set the power level allowing MIDI instruments that are battery powered or have low power modes, to still deliver the juice for your WIDI device. This is particularly useful for electronic wind instruments and similar portable MIDI devices.

Also, 2 WIDI devices automatically switch between the central and peripheral role. This is Bluetooth wording for the things we used to know in the world of MIDI as master and slave. Also, they transmit MIDI messages bi-directionally. This way 2 WIDI devices that are paired function completely as connecting two MIDI cables.

You can now transmit any kind of MIDI message over air. Including long Sysex and timestamp. You simply power up your WIDI devices, and the rest is fully automated.

Simply enjoy going wireless with ultra low latency performance.

Group Connectivity: MIDI Thru and MIDI Merge Groups

When you go into more complex setups with wireless group connectivity, you need to educate yourself to fully benefit from these features.

For instance, your group always has 1 central. Besides this you can add up to 4 peripherals.

This means you need to manually force the role of your WIDI devices first. Next you create the group in the user-friendly app and save that. When you reboot your devices, all settings are loaded by default.

As communication is duplex, you actually create a MIDI Thru or MIDI Merge functionality. With duplex we mean that communication is bi-directional. You can talk in two ways between your devices.

In short. this means that with this firmware (v0098 and up), you can bypass MIDI interfaces, MIDI merge boxes and MIDI Thru boxes. You now can create the following wirelessly:

  • 1-to-4 MIDI Thru — Group of max. 5 WIDI devices
  • 4-to-1 MIDI Merge — Group of max. 5 WIDI devices

Multiple groups simultaneously
The short answer is: YES YOU CAN!

You can create groups starting from 2 WIDI devices. You can have multiple WIDI groups to build a complete wireless system with automatic setup. This means, you create the group step-by-step first via the WIDI App. And when it is saved, it connects instantly upon reboot.

This way, you can fully automate your advanced MIDI settings by setting your different connections by default via multiple groups. This goes for instrument to instrument pairing to groups of max. 5 WIDI devices. And they can function besides each other as well. This way, you can manage your virtual cables and set automated connection by default.

Get it. Set it. Enjoy it!

What about USB MIDI?
As always, you are right. This question cannot be more valid. The missing link is USB MIDI. That will be delivered by a next concept named WIDI Uhost.

With these 3 first members of the WIDI family, you can seamlessly integrate all your MIDI devices into one wireless network.

As WIDI Uhost is still in an early stage of development, it is best to keep the information a bit limited. As a lot can change over time.

WIDI Uhost can be seen as the successor of the legacy WIDI BUD.

In its essence WIDI Uhost is a multi-solution for USB MIDI. This device will allow you to connect devices that are only USB slace, or USB host or you can use it to add Bluetooth MIDI to devices that do not carry this.

To summarise:

  • USB MIDI to MIDI
  • USB MIDI to Chrome OS / Linux / Windows / Android
  • USB MIDI to Bluetooth MIDI
  • USB MIDI to iOS/macOS

What can you do with it? Well….

Visit this page!

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This blog is constantly updated with the latest developments. Therewith it is a dynamic documentation for Bluetooth MIDI Enthusiasts.

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