Midi stopped working with iOS 15.4

I saw the same behavior with my iPhone 12: After reinstalling simplypiano it worked, just before I restored purchase of the subscription, then did not work, I think this is reproducible. So this means, the problem is not related to drivers.

That’s interesting. It worked for me after the restoring the purchase. I used it for about 30 min also. I come back later and it stopped working. If it was simply piano they would do a quick release since this all they do but I think it’s on the OS side.

What really gets me is that they are acting like they didn't know about this issue 2 months ago. It had been reported to them then, but your comments indicate that they are acting like they didn't and that they just now escalated it to that level....I have to tell our app's customers that they just can't use it with older Yamaha keyboards right now until Apple fixes it, which is not great for any business model.

Today everything works.

yesterday my iPad Pro 11” with iOS 15.5 did not work with either usb midi or usb audio connected to my Roland fp-90x keyboard

today my iPhone pro 13 iOS 15.5 and the iPad Pro worked fine

I got the iPhone working first and was surprised the iPad worked

i did have a power outage so my digital piano was disconnected from power. Normally it left plugged in but off.

I have to call them and they will do a live diagnostic while I run the apps. I'll update here after the call.

Here is my reply to Apple:

- Names of other MIDI apps that you said are affected

       - Simply Piano 

       - MIDIWrench

       - Synth One

       - Midi Sheet Music

       - MIDITrail

- Exactly what external hardware are you using including the brand and model info from the cable, external MIDI controller, etc.

        - Yamaha YPG-235

        - Yamaha NP-V60

- What software or firmware versions are you on (if devices that have onboard control and use SW/FW).

              - The keyboard I have uses internal driver and is plug and play and so are most of the keyboards mentioned in this forum: https://discussions.apple.com/thread/253771323?answerId=257431253022 There are a lot of other people that are having the same issue. 

I will call the support number and do the live diagnostics

Hey Martin_Q, Here is my ticket number: 101718858459

I am switching jobs and haven't had the time to call apple so they can do a remote diagnostic and downloads the results. The reason this is hard is because you have to call apple, they do 2-3 transfer with long wait's before you get to the person that does the diagnostic. I did it once but my support rep told me they lost the data so I have to do it again. I came close to starting the test again but had to drop for a customer call. I am going to try again next week. Sorry guys but I'll keep at it. Please keep calling Apple.

I have the same problem. iPad Pro 12.9 Gen 2. None of the MIDI apps work anymore.

I sent a feedback to Apple. Here it’s the link to do that.

https://feedbackassistant.apple.com/feedback/

Same problem here same iPad pro and Yamaha Moxf8. I can't believe the iPad bricked the piano apps from working the second I updated the OS!

I am using a Yamaha LIX 96 interface and hooking midi to USB to camera connector and it is not working anymore after the update to Moxf

Here it’s the link to Apple Feedback.

https://feedbackassistant.apple.com/

Buy irig2

Please go Midi issue | Apple Developer Forums

And insert comments there. Developer forum is the right place where explain the issue.

YAMAHA has reported the issue to Apple, as I saw recently in the YAMAHA corporate site

I tried yesterday on iPhone 7, and it didn’t work. Installed 15.6b1. Same problem. I’ve already reported. Again and again and again. Lol