Logic CPU overload with midi controller

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Level 1

5 points

Logic CPU overload with midi controller

I'm having a problem wherein my midi controller keyboard seems to cause Logic to suck up the entire CPU, making getting anything done next to impossible. Now, this only happens when the controller is powered on (it's a Nektar Impact LX61+, if that makes a difference). My audio interface doesn't cause this problem at all when it's connected, and the problem goes away immediately once I disconnect the keyboard. This is incredibly annoying, and I'm hoping someone has some insight as to what might be going on, although I've seen dozens of threads discussing Logic sucking up CPU that go back several years, and I haven't seen a fix.

It's important to note that this problem happens whether I'm in a project with dozens of patches loaded or in a brand new empty project after a fresh restart, so I don't believe that is related. As well, before I acquired the LX61+, I was controlling midi just using a microKorg XL, and I never had these issues. Although I should also note that the LX61+ did not begin causing this issue until I had been using it for a couple hours. But it's been consistently doing this since the first time it happened.

Here are some of the troubleshooting steps I've already tried, none of which seemed to have any effect at all:

- Re-installed Logic and drivers

- The controller is powered by USB bus, so I purchased a powered hub

- Tried a different USB cable

- Tried fresh project

- Loaded Logic and the controller on a different, brand new computer (2016 MBP, 16 gigs ram, SSD), exactly the same performance issues

- Tried the keyboard's low power mode

- Increased I/O buffer size in Logic

- Rebuilt defaults in the Control Surfaces menu

Am I missing something glaringly obvious that will make me feel like an idiot as soon as I read it?

MacBook Pro, OS X El Capitan (10.11.6)

Posted on Dec 27, 2016 1:56 PM

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Answer 1

fotocodie Author

Level 1

5 points

Dec 27, 2016 5:03 PM in response to fotocodie

Another thing that is really driving me nuts here is that the problem only seems to be existing in Logic. When I bring up Garageband, there doesn't seem to be a big strain on the CPU causing it to lag like in Logic.

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Answer 2

Pancenter

Level 6

14,788 points

Dec 27, 2016 5:39 PM in response to fotocodie

Did the Nektar LX61+ come with software you installed?

It seems to me that is must have something to do with the control surface setup.

Did you actually delete the control surfaces file?

Follow this... deleting Logic's preference file will require some setup (audio device...etc), deleting the control surfaces file will set to complete default. Unless you deleted these files you really haven't gone back to square 1 even though you re-installed Logic.

With Logic not running:

In the Finder, choose Go > Go to Folder from the menu.

Type ~/Library/Preferences in the "Go to the folder" field. (Type exactly ----> ~/Library/Preferences

Press the Go button.

Remove the com.apple.logic10.plist file from the Preferences folder. Note that if you have programmed any custom key commands, this will reset them to the defaults. You may wish to export your custom key command as a preset before performing this step. See the Logic Pro User Manual for details on how to do this. If you are having trouble with a control surface in Logic Pro.

then delete the com.apple.logic.pro.cs file from the preferences folder.

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