Logic Pro X Hanging Notes with Motu Express 128

no,

i bought this computer second hand with Mavericks pre installed,

so I've only ever had Mavericks Running on it

Thanks, appreciate the input!

no problemo!

Jakob,

Pleae check both the System library and your User Library for Midi drivers you are not using...

They are found in Audio/Midi Driver in each of the two different libraries and delete any drivers you are not using.

Then restart your Mac and test......

Also please list any drivers you have in each of those libraries that you are using still....

Ok,

i found a host of Digi MIDI Drives i am not using under MacPro//Library//Audio//Midi Drivers & got rid of them,

i don't know how to check both the system library & user library as i can't find the correct folders,

i have given it a test & things seem to be much improved however i still got a hanging note but this time it was after quite some time (usually they are much more frequent)

the drivers i am still using are AKAI MPC Midi Plugin, Motu Midi Driver, NIUSBMaschineControllerMidiDriver,

please let me know in more detail if you can how to check the system & user library for problematic drivers

Ah! Digidesign (AKA Avid these days....) Midi stuff.. the most common cause of issues....

User Library in Mavericks

Open your home folder (/Users/yourusername) in the Finder. Depending on your Finder settings, this may be as easy as simply opening a new Finder window. Otherwise, choose Home from the Finder’s Go menu (Go > Home); or press Shift-Command-H.

Still in the Finder, choose View > Show View Options (or press Command-J).

Near the bottom of the resulting View-Options palette is a setting called Show Library Folder. Enable this option. Your Library folder is immediately visible.

Close the View-Options palette.

System Library is found in the root of your System Drive....

Ok,

I'm fairly certain i got rid of them,

ill give Logic a whirl shortly to see how it goes..

still getting hanging notes...

they are just a bit less frequent

Just to confirm...

you restarted your Mac yes?

you have installed the very latest midi drivers from the motu website?

the midi keyboard you are usng... If you are using one... Are you just connected via a midi out from the keyboard to an in on the motu? If you have connected both in and out.. Remove the in from the keyboard and test.....

if you are not usng a midi keyboard then what are you using?

Yes,

Restarted the mac,

installed latest drivers from motu website,

keyboard I'm using is akai mpk 49 plugged into the computer via usb

Okay.. and you are using the Motu to do what exactly?

using the motu to send midi to an external sound module via external midi track in logic

Ok.. and that only the external midi device (which is what?) is being affected by the hanging notes?

If not, then its not your Motu but something going on with the Akai.... as the Motu isnt being used for anything else except sending midi data to the external device.... You can test this by unplugging the motu and restarting your Mac and testing again....

the external device is a korg tr rack but I've tried with different modules and had the same result,

software instruments work fine, i can't test by unplugging the motu because then i won't be able to send midi to the rack,

I'm fairly sure its not the akai or the rack as I've tried with different keyboards and modules with no luck..

Okay.. this is making a lot more sense....

(and thanks for sticking with this process of troubleshooting..)

So if it only happens with the Korg TR Rack (or any other midi rack device you have tested..) then to rule out everything else...

1) Look at the Event List in Logic ... for one of these tracks and see if you have duplicated notes or other weird midi data..... in there..

2) The other possibility is the midi cable you are using... from the Motu to the Korg.... Can you or have you switched cables to make sure its not an issue with the one you are using?

if it's neither of these then.. Yes, it looks like its some issue with the Motu (or one of the remaining other Midi drivers you have installed) though frankly I can't work out what... given you are connected directly to a USB2 port... as I have a couple of clients using the 128 via USB2 ports on older macs with Mavericks and LPX and they aren't having any issues with external midi devices or external midi tracks...