July 2

Wireless MIDI Groups via WIDI app for iOS and Android


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WIDI Wireless MIDI
Thanks for showing you interested in WIDI. The wireless MIDI solution by CME.

With WIDI you have access to the future of MIDI. This blog explains the latest developments for WIDI. Especially how to create wireless MIDI groups via the WIDI App. Take your time to understand the basic terminology and walk through the entire process step by step. 

How we work!

Before you go deep into the possibilities of WIDI technology, please ensure to understand the way we work at CME.

As a small innovator the CME team focusses entirely on the development of Bluetooth MIDI technology, our mission is to deliver Bluetooth MIDI to any MIDI enthusiast and make it available to any MIDI device.

Are we there yet? No! There are so many different forms of MIDI and MIDI devices, that this is our real challenge. Sure, we can deliver WIDI and develop an entire system that works perfectly with WIDI devices. That is our short term focus.

Our long term goal is to allow you to use Bluetooth MIDI anytime. It should not matter if you work with iOS, Android, Windows, Linux, ChromeOS, MacOS or other Bluetooth MIDI devices from Korg, Roland, ROLI or any other manufacturer. Also, if you work with traditional MIDI hardware and without computers, WIDI is also for you. 

The goal for 2021 is that with WIDI you can connect any MIDI instrument and enjoy the benefits of wireless MIDI.

Added new feature in January 2022. Group Auto-Learn allows up to 5 standard Bluetooth MIDI devices as part of the WIDI group. Learn more!

Community-driven development

Of course, WIDI technology and Bluetooth MIDI is developed and approved by many clever engineers. That said, it is not about them. It is about you. What do you really need? What does work for you? And what do we need to do to make it user-friendly and easy to operate.

That is why we need you! You are in the center of our development process. You are the Community of MIDI Enthusiasts. With the support from you and the entire Facebook Community we can:

  • Fix bugs before going public
  • Create a better explanation and improve the experience for the entire community

We are blessed with a community that is so actively bursting our developer's bubble. You provide us focus, honesty and allow the entire community to enjoy your contribution later down the line. 

Now we got our intentions sorted out, let's move to today's topic: the WIDI app for iOS and Android.

Feel welcome to share any feedback with us. We'd like to know everything.

We are pretty confident that we can solve bugs, or deliver a better explanation through our videos and this blog. Before you start creating wireless groups via BLE MIDI, it is important to explain a couple things about our technology. 

Read the remaining part of this blog with care and check the WIDI App Manual for the latest updates!


iOS WIDI App version vs WIDI firmware version

First of all it is important to distinguish two different types of updates. You will need the latest iOS app version 1.2.XX or higher. You will need to update that first. Next, to fully access the latest features, you need to upgrade your WIDI devices' firmware to version v0137 or higher.

Android WIDI App version vs WIDI firmware version

Also for Android the same rules apply. Only it concerns different versions. You will need an updated Android app version 1.3.XX or higher. You need to update that first. Next, to fully access the best experience and group connectivity, you will need to upgrade your WIDI devices' firmware to version v0137 or higher.

Upgrade firmware one-by-one!

It is important to understand that WIDI devices upon themselves are designed to be as easy in use as possible. That is why WIDI devices pair automatically. They automatically switch between the central role and the peripheral role.

Generally speaking, it does not matter if your device is the central or peripheral. As both roles allow bi-directional (duplex) communication.

The central and peripheral role become important when updating firmware and setting up groups with multiple WIID devices. You can update your firmware with the WIDI app. In this case, you need to understand that the WIDI App (thus your mobile device) becomes the central device to push settings towards the peripheral (your WIDI device).

If you update one single WIDI device, simply boot it and pair it with your WIDI App. Next you can update to firmware v0137 or higher.

Please note, when working with multiple WIDI devices, you can only update one-by-one. A common mistake that is made, is to boot multiple WIDI devices at the same time. This will make the WIDI devices pair automatically to each other. And when paired, the WIDI App cannot locate the device anymore as they are already occupied.

So, when updating firmware, power your WIDI device up one-by-one and update the firmware one at the time!

If you run into complexities, try these options first:

  1. Ensure you are using WIDI App 1.2.XX (or higher) or Android App 1.3.XX (or higher)
  2. Ensure your iOS and Android versions are updated to the latest alpha versions (not public betas)
  3. Ensure your mobile device and WIDI Master are the only BLE MIDI devices that are powered. This to avoid automatic pairing with other BLE MIDI devices. This is only for Bluetooth MIDI devices. Not all your Bluetooth devices.
  4. Ensure you empty cache on your mobile device by toggling general Bluetooth settings off and on.
  5. Enable Bluetooth in general settings, but do not pair it already there. Only pair it from the WIDI app.
  6. Next, pair iOS or Android device and WIDI Master in the WIDI App. Is there a connection established? Do you see blue leds on WIDI Master? Do you see the WIDI Master showing in WIDI App?
  7. Now you can update the firmware. If not, please reach out to us via the support form. 

How does this work?

So, if you want to upgrade the firmware for your specific WIDI device, you need to operate this step by step. First you turn on one WIDI device. Next you pair that with your WIDI app. Now you can control the settings of your WIDI device (peripheral) from the iOS WIDI app (central).

When you have upgraded the firmware for the first, switch it off. Only after this, you can power up the second. You repeat this process before you power up the 3rd WIDI device.

It may seem a bit complex at first, but the automatic pairing and role automation is designed so that any enthusiast, no matter the level of experience, can work with WIDI technology. When creating wireless MIDI groups, you enter a more advanced world of wireless MIDI that requests knowledge and dedication to make your MIDI setup future-proof.

So, there we have step 1! 

First update all your WIDI devices with iOS WIDI app v1.2.XX (or higher) or Android WIDI app v1.3.XX (or higher) to firmware v0137 or higher. And do this by manually booting each device one-by-one and allow it to pair WIDI device to WIDI app to push the new firmware into your WIDI device.

What can you do with WIDI firmware v0137 (or higher) and the latest WIDI App?

  • Group connectivity
    * Set up to 4 peripherals and 1 central with duplex transmission
    * Create 1 group of up to 5 WIDI devices in a Bluetooth MIDI network.
  • Renaming of WIDI devices
  • Advanced settings
    * TX power: Save power consumption by selecting lower dB level (note: the connection range will be reduced accordingly).
    * BLE role: Force to Auto or Peripheral mode.
    * Set personal preferences: optimise for low latency performance or low jitter performance
  • Reset default connections
  • Factory reset
  • Timestamp support
  • Long SysEx support
  • Compatible with Korg BLE MIDI drivers for WIN10

So - Step 2 - let's try this explanation video first! Let us know if this makes it clear to you!

Read this transcript that describes the video content step by step!

  • Step 0: Ensure you use iOS WIDI App (version 1.3.11 or higher) or Android WIDI App (version 1.3.9 or higher)
  • Step 1: Please upgrade your WIDI devices to the latest firmware (first fw version for group connection is v0137). If you have multiple units, remember to not power up multiple WIDI devices at once. As they will pair 1-to-1 automatically, and that will make it impossible for the iOS app to pair with your WIDI devices. 
  • Step 2: Set your WIDI to the peripheral role and give it a new name.
    * Select "Force peripheral" in BLE role section, the setting will be saved into your WIDI automatically.
    * Click the device name in Status section to rename your device. You will need to reboot your WIDI device to see the changes.
  • Step 3: Repeat above steps to set all WIDIs that you want to add in a group.
  • Step 4: After you set all WIDI devices in peripheral role, please switch them on.
  • Step 5: Click "Groups" menu and click "Add a new group".
  • Step 6: Enter your name for the group.
  • Step 7: Drag & drop your WIDI devices to the central and peripheral places.
  • Step 8: Click "Download group", the group setting will be saved in all WIDI devices. Next, all units will be rebooted automatically.
  • Step 9: Wait for few seconds, all WIDI devices that you set as the group will connect to each other.
  • Step 10: All settings will be remembered even when you switch your WIDI devices off. Next time when you switch them on again, they will connect to each other in the same group.|

    * Note: If you want to forget the group connection setting, please go to each WIDI Status page and click "Reset default connections".

How many WIDI devices can I add to this group?

Please note, when working with a Bluetooth MIDI group, there can only be one (1) central. Besides this, there can currently be up to four (4) peripherals. When you switch on multiple WIDI devices at the same time, they will automatically connect to each other. One WIDI device will take that central role (turquoise led indicator) following your manual settings through the WIDI App when creating the group.

Please note, when you are setting up this group, your mobile device has to be the central. Therefore, first you need to force all your WIDI device to become the peripheral mode and not connect with others. Otherwise, due to automatic pairing and role automation, they cannot be found by the WIDI app. As the WIDI app has to be the central to allow you to make the settings for group connectivity first.

  • First set all your WIDI devices to "force peripheral",
  • Next, create your group and select one central,
  • Finalise this process by pushing the manual settings to load by default for all group members.

1-to-4 MIDI Thru // 4-to-1 MIDI Merge

Can I only add WIDI devices to the group?

For this moment, yes! As mentioned before our mission is to deliver Bluetooth MIDI that can integrate and connect with any other Bluetooth MIDI device. This is of course great, and it is what WIDI technology distinguishes from any other Bluetooth MIDI adapter manufacturer. That said, this mission comes with challenges.

For instance, Apple's iOS and MacOS do not provide fixed original Bluetooth addresses to connect with your WIDI devices. For security reasons, Apple changes the Bluetooth address of its own devices and others every 15 minutes. That is why, at this moment, it is not possible to add other BLE MIDI devices in your group connectivity setup. 

We are aware of this and our clever developers will find a solution for this to allow any BLE MIDI device to be part of the wireless Bluetooth MIDI network. 

MIDI Thru vs MIDI Merge

When creating a group, you can add up to 5 devices. The group always will have 1 central WIDI device.

Besides this you can add up to 4 peripherals. As communication is duplex, like bi-directional, you actually create a MIDI Thru or MIDI Merge functionality. In short. this means that with this firmware (v0137 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

Can I create multiple groups and run them simultaneously?

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.

One WIDI device has a light blue colour?

That is correct. The WIDI devices are designed to indicate their role and activity through different LED colours. The light blue (turquoise) indicates that, that device is operating as a central. The dark blue indicates it are peripherals. Check out this video for a complete understanding.

My WIDI devices light up blue but my MIDI devices do not respond?

In a few cases this is caused by a phenomenon called MIDI loop. Please try to switch off MIDI thru functions in your MIDI devices or DAW. Or deselect WIDI as MIDI Input device in your DAW. When working with MIDI hardware, try to locate the MIDI Thru switch in your MIDI instrument and switch it off.

My WIDI devices disappear (or are only shortly visible) from the Bluetooth general settings?

Once a WIDI has been connected to another, you will not be able to see it from other BLE MIDI device (such as your WIDI App). That is why when you want to connect WIDI device to WIDI app, you must set them one by one. Also you need to force them to the peripheral role prior to setting the group in the WIDI App.

If you do not do this the WIDI device is set to auto role by default. It will try to connect to another WIDI automatically. If this is the case, you have no way to see it from your iOS app because it was occupied by other connection.

When you set a group, that means the central is in "Auto role" with predefined peripheral address. It will only connect to predefined WIDI peripherals. Or switch itself into peripheral mode to connect to another central.

Can you explain one more time central and peripheral in relation to group connections?

When setting a group you set one single WIDI device as a central device. The remaining (max four) WIDI devices you will set as peripherals. This way, the peripherals will not try to - automatically - find other BLE MIDI devices. They simply wait for the central to match the default group setting you saved.

Therewith, after you set the first group, they will only connect to each other automatically.

Once they connect, you are not able to see them from the WIDI App, because all of them are already occupied and connected with your groups central device.

Can I reset a group?

If you want to reset the group, you need to switch on the central first. And only the central. Not the peripherals. 

The WIDI App has to become your temporary central to push group settings into the central WIDI device. Therefore, you need to start with the central first. Simply pair this device with the WIDI app.

Next you can select from your WIDI App the option "Reset Group Settings" to delete the group and create a new one.

How do I reset my Bluetooth connection on iOS?

Please note that Bluetooth cache causes many issues when working with advanced WIDI technology. Just like WIDI is designed with automatic pairing and auto role switching, iOS is developed with Bluetooth cache to improve the consumer experience. 

When using Bluetooth MIDI, you actually become a prosumer. You are digging much deeper into Bluetooth technology compared to a regular Apple AirPod music experience. If you experience issues with your WIDI device on iOS, always try to reset your Bluetooth cache by toggling the Bluetooth off switch in the iOS preference settings. Just follow the instruction below.

Just follow these easy steps to simply reset Bluetooth on iOS and forget your Bluetooth accessory.
1. Launch Settings and head over to Bluetooth.
2. On the right side of the Bluetooth device name, tap on the "i" icon.
3. Now tap on "Forget This Device" button and confirm.

Turn off Bluetooth and Restart
4. Restart the Bluetooth on iOS by toggling the Bluetooth off/on switch in settings

Pair Again
5. Now pair again with WIDI

How do I properly setup iOS and WIDI?

Check out this video and use midimittr as a bridge app on iOS. It works in the background and does not interfere with other music apps you like to use.

I can already connect multiple devices via iOS and MacOS?

Yes you can connect multiple WIDIs with MacOS or iOS as a central as well. It can take up to 7 peripherals. Please note this is based on MacOS/iOS Bluetooth MIDI and can have a negative effect on latency performance. To do this you need to force all WIDI devices to the peripheral role or switch them on one by one. This way they can connect to the central and not automatically pair to each other.

Please note that this is not the same as the WIDI Group connectivity we are discussing and testing here. 

I experience different latency and/or jitter performance with WIDI groups compared to WIDI to WIDI connection?

WIDI groups can introduce a small amount of additional latency. In order to give the appropriate time slot to each connected device, Bluetooth timings cannot be set the the lowest amount like with a direct WIDI to WIDI connection. If your most important metric is latency, make sure you set all WIDI devices in the group to the default "preferred latency" mode via the WIDI app.

If you are working with MIDI clock and are in need of the best jitter performance, make sure to set each individual WIDI device  “preferred jitter” mode available through the WIDI app. 

As WIDI groups are an essential part of our future developments, our engineers are constantly working to improve the firmware to deliver even better results. If you are not satisfied with its performance, please report your feedback. If we are unable to solve it, we are quite easy with refunds.

I'd like to report feedback!

Simply reach out to us through the support form. We are happy to work with you and always try to reply within 24 hours!


Bluetooth MIDI, WIDI, Wireless MIDI

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  • All good stuff. Used Midimttr and it works great with IOS UNLESS 2 WIDImaster devices are connected directly to each other. In that case, you will get a “failed to connect” in IOS and the offerings in Midimttr are greyed out and unresponsive until you release the WIDImaster from direct connection with another WIDImaster. I was hoping unity could have been accomplished.

    • When the WIDI devices are connected to each other, the are occupied and cannot be connected to iOS. The current version of group connectivity allows connection of multiple WIDI devices. Unfortunately, iOS devices changes their Bluetooth addresses every 15 minutes. Therefore our engineers need to find clever solution to add other devices outside of the WIDI range. That said, in time, we will get there.

    • What you can do is create a group within iOS. You simple pair the first WIDI device and after this one is paired with iOS, you can pair the second one,. Or you can set both WIDI devices, one by one, to peripheral mode, so they do not pair to each other. Next you can build a group following the iOS standard. Please note, performance wise, this is not similar to a WIDI group. Hope this helps.

  • I’ve just had issues with SL Mixface that seemed to shut the (3) Widis down. I have fixed the problem via group creation but still don’t fully understand what happened or if the solution could have been simpler. I seemed to get it back at times but left it for a while and connection was lost again. I suspect a similar 15minute timeout like Apple maybe?

    • Hi Terry, thanks for reaching out. It is hard to say from here. Make sure you update your WIDI devices to the latest firmware and do a factory reset afterwards. I think it is best to get in touch directly. I’ll reach out via email.

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