Logic Pro play some notes quiet randomly, When I Play Fast

MacBook Pro (Retina, 13-inch, Early 2015)

Processor 2.7 GHz Intel Core i5

Memory 8 GB 1867 MHz DDR3


Midi interface: KeyLab 61


Logic Pro version 10.4.4


I am having a midi issue in Logic pro. When I play any instrument in Logic there some notes that sounds really quiet and this happens randomly. When I record what I play I notice that in the midi region those notes that I don't hear have a low velocity close to zero.


When I try my keyLab 61 with other softwares like Cubase Ai Le element 10, even MainStage or Rhapsody Grand stand alone version it works fine. When I also use my Keyboard to play midi all the notes are played correctly.


I tried to turn my computer on and off several times and I also closed and opened Logic pro but the problems remains.

MacBook Pro 13", 10.14

Posted on Feb 19, 2019 10:32 AM

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Feb 21, 2019 9:59 AM in response to Data Stream Studio

Thank you for your quick reply. And no it was not my technique. I fixed the problem by deleting the user preference: com.apple.logic10.plist and com.apple.logic.pro.cs (delete the later if you updated from an earlier version of LogicPro).


8. Delete user preferences

Before deleting user preferences, note any specific preference settings that you’ve made, and save any custom key commands you've created. Deleting preferences removes any custom preference settings and custom key commands.

To delete the user preferences, do the following:

  1. Quit Logic Pro X.
  2. In the Finder, choose Go > Go to Folder.
  3. Enter ~/Library/Preferences, then click Go.
  4. Remove the "com.apple.logic10.plist" file from the Preferences folder. 
  5. If you upgraded from an earlier version of Logic Pro, also remove the "com.apple.logic.pro" file.
  6. Restart your Mac.

After deleting preferences, open your project and try to reproduce the issue that you were experiencing. If the issue no longer occurs, open Logic Pro X preferences, reapply your custom settings, and import your custom key commands.


Source: https://support.apple.com/it-it/HT200260

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Logic Pro play some notes quiet randomly, When I Play Fast

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