Logic Pro X, problem with Legacy sounds.

Hi Kamil, this looks like a glitch in the Sound Library. To be honest, Logic's SL has always been like this - a bit of a mess. No one knows exactly how it works and why it's been implemented this way and never improved.

Anyway, enough of my ranting. You could try to refresh the Library (click the icon in the upper-left corner of Logic's window):

Then click on the settings button and choose "Refresh Library":

Then quit Logic app (Command+Q), reboot the Mac, relaunch Logic again and open Library again.

If that doesn't help, open the Sound Library Manager and try to reinstall the whole thing (if it's feasible, of course).

Sorry these measures didn't work. Perhaps, you could have a look at folder structure in this folder (that's where Logic's sound library content is supposed to be stored):

[system HD (normally, it's "Macintosh HD"]/Library/Application Support/Logic/

In addition, since instrument patches are actually stored within Logic's app bundle, you can also explore what's going on there: control / right-click on Logic Pro filename in /Applications folder, then choose "Show Package Contents" from the drop-down menu that opens.

In the folder that opens navigate to /Contents/Resources/Patches/Instruments folder. If there's double folders there, that's most likely what's causing this glitch.

Logic gets file location and listings from Spotlight.

You could try and reset Spotlight on your system drive.

I'm on an older OS (10.13.6) so can't guarantee Spotlight's settings are the same.

Go To: System Preferences/Spotlight..... select the Privacy tab, select + to add a Drive/Folder to the list.

When doing this I selected my system drive. When you ok this operation and reboot the computer, the spotlight cache is deleted. After rebooting the computer open the Spotlight prefs again, make sure all areas you want searched are selected under the 'Search Results" tab, then go to Privacy and remove the system drive from the "Do Not Search" list. And reboot once more, once booted Spotlight will rebuild it's search cache. to what is exactly on your drive. Will take a bit, leave it alone for a while.