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I’m frustrated

MPK mini mkII middle c key stuck

Bought my mpk mkII twomonths ago and worked perfectly since a week ago, when suddenly the key C (or even if I transpose the keyboard, the note C) sends a MIDI message that i mantained it forever, even if I just pressed it and release quickly, it sends a MIDI message as if I hold it forever. I know it's not an computer problem because I tried with a friend's computer and it doesn't happen with it.

We both use mac OS Sierra and I use logic pro X while he uses garageband.
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  • Hey Fernando,

    Thanks for posting!

    If this is not happening with another computer, I would say it probably does have something to do with the computer you are using. If the sustained note was still present with the other computer then I would say it has something to do with the MPK as the MPK would be the common denominator in both tests but this is not the case. The fact that the problem note "moves" across keys also indicates that this is not likely derived from the hardware as the keys are functioning.

    The output of the MPK can easily be tested with a MIDI monitor. This will tell us if the note is sustaining longer than it should be.

    For testing on PC:
    MIDI-OX

    This video will get you set up quickly for Input Monitoring in MIDI-OX:
    Monitoring MIDI Input with MIDI-OX

    For testing on Mac:
    snoize: MIDI Monitor

    Do any of the keys sustain past your input?

    Let me know!
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  • Hi! thanks for the help!



    here I show you what the MIDI monitor shows when i press and then release de D3, and the same when I do that with de C3.

    The problem that I think it's ocurring is a configuration change, that is sent into the DAW, so I would like to know what do you think about that and if you agree how could I reboot my mpk or something.
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  • There is no reset or reboot for the MPK mini mkII as you can use the preset editor to change its output. I can see from your screen capture that you had depressed both keys for around one second each. The notes are not sustaining, so the MPK is sending MIDI properly.

    The problem could be derived from Logic itself. Try moving the com.apple.logic10.plist file to another directory (your desktop will suffice and it will be easy to find it again later). You do not necessarily want to delete this file as it contains your Logic preferences. It can always be moved back later to restore your preferences.

    After moving the file, launch Logic. Logic will rebuild this file if it finds that there is no .plist in the directory at launch. If the issue is resolved, you know this was the cause. If it does not resolve the issue, you can delete the new .plist file that Logic created and move your original .plist file back to that directory.

    The following Apple article will show you where to locate this file in Step 10:

    Apple - Get help with Logic Pro X

    Try that and let me know how it turns out!
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  • That sounds like a great idea nick! But I can't finde my com.apple.logic10.plist file in Library/preferences, whili it is there for other applications and even for some logic's AU , so I don't know if it's in another place or maybe I don't have that file :(
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  • This can be a little confusing as there are two Library directories you could be accessing. Here is the file pathway:

    Macintosh HD > Users > [Your user name] > Library > Preferences > com.apple.logic10.plist

    I hope that helps you!
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  • Auch, I feel so dumb! haha, I still can't find it.

    I'm sending you some screen caps so lets see if you know where it can be
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  • Sorry you're having trouble finding that file. It does look like you are in the correct directory. This Apple article might help you a little further:

    Apple - Can't find Logic Pro X preference file

    If you have no success with that, I would recommend reaching out to Apple directly. They should be able to help you with that as you are using both their operating system and audio production software.
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