1. Mac - "Controller Not Connected" message

Modified on Mon, 20 May 2024 at 02:30 AM

If you get the message "Controller Not Connected" then do the following:

  1. Check in the System Report that the C1-xMP1 shows up.


If it does not show up, there is a connection issue. Connect the cable provided directly from the MIDI port of the controller, to the computer’s USB A port (not USB-C port). 



If you are connecting to a USB-A port directly to the Mac and it still does not show up in the System Report, you need to check the internal micro-USB cable that connects on the MIDI board. To get to that port, you need to unscrew the bottom cover.


If these steps do not solve the issue, send us an email at support@mpmidi.com to advise further on how to proceed.



  1. If it does show up in the System Report, then make sure that it shows up and that it is active and online in MAC’s MIDI Studio. (Do not rename the C1-xMP1 in MIDI Studio on the Mac) as shown in the screenshot below. 

If you have more than one C1-xMP1, delete the additional one.




If the C1-xMP1 does not show up in the MIDI Studio, try Refresh MIDI Setup from the top bar menu option.


and try pressing the Rescan MIDI button




  1. Disable the MIDI In/Out of the C1-xMP1 in the DAW as instructed here. The controller should now be found by the MPH plugin shown on the left bottom of the MPH plugin window.


To Troubleshoot further, see this article



Was this article helpful?

That’s Great!

Thank you for your feedback

Sorry! We couldn't be helpful

Thank you for your feedback

Let us know how can we improve this article!

Select atleast one of the reasons

Feedback sent

We appreciate your effort and will try to fix the article