midi out

Hi there, this does seem weird indeed. Try disconnecting your ALL external MIDI devices first, and check again. That's the first thing I'd do to rule out the external equipment. If this issue disappears after that, try reconnecting the devices one by one until it appears again to identify the exact device.

If this issue still persists regardless of external devices, I'd look in the Environment for the potential culprit. There might be an object which is sending these MIDI events out. Environment is typically project specific (i.e. it's unique to every project). You could open the Environment from the top menu bar: Window > Open MIDI Environment. Once it opens up, look up "Click and Ports" layer, and also browse through the layers to check for the misbehaving Environment object.

As a sidenote, if you have a project loading by default when the Logic app launches, that also causes its Environment (with that particular MIDI bug already present) to load. You could simply set Logic not to open projects from a Template in Logic Pro X > Preferences > General > Project Handling (tab) > Startup Action (setting): choose "Do Nothing" to try (you'd have to create a new project manually, but when you do so, create an empty project, as opposed to opening one from a saved template).

Hope that helps, cheers!

Most welcome, glad you managed to ID the culprit! Unfortunately, I have zero experience with Presonus interfaces, so I can only provide general troubleshooting tips.

Next step I'd try is re-installing its driver, if it requires one to work (some interfaces are plug-and-play). Also, you could delve into Audio MIDI Setup utility (in Applications/Utilities folder), to check whether there's a setting there that causes these MIDI events to be constantly sent out. Also, check Presonus' tech support resources, maybe it's a known issue which has a fix.

Garry,

Logic's Control Surface implementation causes a raft of varied problems... if you don't need control surface setup just leave it disabled. There are ways to fix the problem. p.s. Logic doesn't show a transfer of MIDI data in the control bar if there's no MIDI Interface attached. The problem was not the Presonus.

Under the same Menu where you select Bypass, select "Settings". You should have a two pane window, the important part is the right-hand side... a window of devices, try deleting them all. You may have one control surface listed or several... Delete all of them, close Logic and restart.

Garry,

Go the upper left Logic Pro menu, open and go to Control Surfaces then select "Bypass All Control Surfaces" quit Logic then reboot Logic...does the problem still persist?

I don’t know if this helps but on your screenshot we see a sustain midi value (cc 64). So, check any midi controller especially sustain pedals. Sometime faulty midi controllers can output weird data.

Or..... simply rebuild the Control Surface file under the same menu,,, Rebuild Defaults.