I was not able to use my KeyLab Essential 49 with Logic Pro X (Version 10.4.4) and MIDI Control Center (Version 1.7.5.812). In my setup Logic does not recognize my KeyLab Essential 49 during scans in Control Surface Setup. While KeyLab 49 is listed as a supported Control Surface, KeyLab Essential 49 is not. Apparently now everything is resolved (although I have not yet tested the Save, Punch and Undo buttons on the controller). The Transport buttons on the controller now seem to be functioning as intended after I followed these steps:
1) Install and/or update Arturia's MIDI Control Center
2) In MIDI Control Center, go to DEVICE SETTINGS (for me this appears in the upper right-hand corner of the window)
3) Choose HUI in the drop-down DAW Mode options
4) In Logic Pro X, go to Control Surface Setup in Logic Pro > Control Surfaces > Setup...
5) Manually install Mackie Designs HUI
a) Go to New > Install... (drop-down menu is in the upper left-hand corner of the Install window on my setup)
b) Select (click) Mackie Designs / HUI / HUI from the list of devices
c) Click Add (this button is in the lower left-hand corner of the Install window on my setup
It would be great if the Logic team and Arturia could work together to resolve this and get Logic to recognize the KeyLab Essential controllers. (Seems to my the onus is on Apple here, since I bet the Essential controllers have been big sellers since their release). The issue is mentioned here:
https://www.soundonsound.com/reviews/arturia-keylab-essentialAnyway maybe this post will help someone else who has the same problem I did.
Cheers,
L