random pitch bend in Logic Pro X - Please HELP!

I'm plugged in directly via USB. It still seems to be working, and works after reboot. So I think I am in the all clear :-)

I’ve got the same issue after I updated to latest OS

pitch on midi just randomly changes a semitone

I’ll hit middle A on the controller and it plays fine then out of nowhere it’ll suddenly be playing a sharp note

if you watch on a meter you can see the change happen

really annoying as makes writing music basically impossible as it just randomly changes notes after they’ve been recorded to midi

or even as I’m playing live without any recorded notes in the sequencer

I found that it was an issue with the pitch bend wheel on my midi keyboard - it was throwing out random bend info even though the wheel wasn’t being touched.

yhis can be tested by downloading a free midi analyser and seeing if anything shows up when you’re not touching any keys

mine showed and continuous stream of random bend info

I then went into logic settings and disabled the pitch bend so Logic no longer receives any of that info

(fine for me as I don’t really use the pitch bend on midi anyway)

I would suggest trying this first

Thanks for the update, Roberto! Right now I am testing the keyboard with the latest version of "MIDIMonitor" with a Roland Um-One midi connector. I am not getting any pitch bends unless I manually touch the wheel. Tried intervals of 5-10 minutes. In Logic Pro X it is sporadic, but the longest duration without a pitch bend is about 4 seconds. I'll try disabling pitch bend in Logic Pro.

Hello Morozco,

Thanks for the suggestion! I checked on the status of Logic by going into my app folder, and clicking "get info" on the logic app. It does not appear to be using rosetta, as that is unchecked. Is there another place I should be looking for that setting as well?

So this is weird, and we'll see if it maintains working:

1) Plugged my power usb and Um-One into an old Intel MacBook Pro with Logic ProX

2) Monitored MIDI input/output and opened up Logic ProX on the Intel MacBook Pro - Worked Flawlessly!

3) Plugged the Um-One from the Intel Mac to the M1 Mac, while USB connection (power) was in the Intel Mac. No input/output picked up on M1 Mac.

4) Unplugged the USB from the Intel Mac and connected to M1 Mac

5) Disconnected the Um-One MIDI from M1 Mac

Now it is playing and recording without issue. Maybe a firmware issue or compatibility problem with AKAI MPK 261 and Sonoma? We'll see how long this lasts. In Logic Pro X on the M1 Mac for about 5 minutes of recording now without any pitch bends!

Originally I was only using USB, getting power and data, which had worked without issue for the past 3 and a half years. Then it started pitch shifting. Then I switched to power from DC adapter, and midi data via 5-pin on the M1 Mac with continued pitch shifting.

Then I checked it on an Intel Mac with no pitch shifting via 5-pin midi and separate power. After that disconnected 5-pin midi and tried via usb on Intel Mac, still no pitch shifting. Then I completed the steps above. It is now only connected to the M1 Mac via USB (no midi cable) and continues to work without pitch shifting. Just need to do a restart and see if it continues to work.

Ok. Just use the USB cord. Using the 5pin midi will just complicate things. If you are still having issues you might need to go to control surfaces setup and delete your keyboard and rescan to use again. Also how are you plugging the usb to your Mac? Directly or using a hub?

The exact same thing is happening to me with an Akai MPK 261, and have taken the same steps to no avail. I additionally updated the firmware in my MPK and it did not yield any changes.

Have you tried running Logic in native mode? You may not need Rosetta with your updated plug-ins and instruments.

Are you plugging in your keyboard to the computer with usb and a 5 pin midi cable?