AFter five years of problem free use, my mixer pots have suddenly developed a case of the jitters -- that is they jiggle up and down within just a tiny range, sometimes one pot, sometimes several, no perceivable pattern, and can't move them up or down.

Question

After five years of problem free usage, my Logic Pro mixer pots have suddenly come down with palsy -- that is, jiggle up and down within a tiny range  -- sometimes one, sometimes several, etc., no pattern that I've been able to grok. And any pot that is jiggling can't be moved up or down. I tried circumventing my 828 converter and coming straight out of my desktop iMac OS X, but that didn't help. I also moved a Logic midi file over to my laptop, and when I played it on Logic the jitters were there too. Anyone ever develop this bug, and if so, do you have a fix? Could it be a corrupted program?
David Shire  [email protected]

Answer 1

Have you recently used any midi controller with Logic.. such as a hardware controller or even an iPad app.
If you used an iOS app, power down (Not just put to sleep) your iOS device and see what happens.. If that fixes it you are running an iOS controler in the background and so you will need to close it..
http://support.apple.com/kb/ht5137
Failing that, quit Logic and trash the Control Surface pref file.... restart Logic and see if that cures it..
In the Finder, choose Go > Go to Folder from the menu.
Type ~/Library/Preferences in the "Go to the folder" field.
Press the Go button.
Delete the com.apple.logic.pro.cs file from the preferences folder.