I think I did install a driver many incarnations ago, but not sure if that's still pertinent. A search for 'emagic,' or 'MT4' shows nothing. Here's a screenshot under 'Audio Midi setup' - which might be the best place to troubleshoot. Assuming you know what that it and where to find it? I think I ultimately added it from inside that area. It has always simply worked - I've used it since Yosemite and earlier, on this same MacPro Attachments Screen Shot 2017-04-26 at 10.41.38 AM.png (111.92 KiB) Viewed 2592 times.

Thanks David - I have that installer and as mentioned, when I first tried to install it said: 'Your computer does not need this update'. Oddly I tried once more and it installed, but still no joy. What have you tried exactly? Do you have a MIDI keyboard connected to the MT4? Have you tried playing that keyboard and see if it can trigger an instrument in Logic?

Since the MT4 appears in Audio MIDI Setup and is not grayed out, that indicates that your Mac recognizes it as connected - so it should work? Thanks everyone - put this one down to user impatience!! Internal medicine essentials for clerkship students pdf. So I assumed it wasn't working as only the patch light came on when plugged in, but as soon as I open AMS or Logic Pro X the light switches to USB - and works fine for MIDI coming in from my old controller keyboard. I didn't get this far when I posted the question as I gave up when I saw the Patch light - note to self - be more patient! So apologies for the false alarm and thanks for all the ideas and encouragement!! Only unanswered questions I suppose are whether I needed to install the driver at all or whether it would have worked with drivers supplied by MacOS - something for another time I guess! Thanks again Mike.

Emagic MT4 drivers? I hanvt used a midi interface or an external midi synth for so long ive forgotten how to set it up in logic! Im having an ass of a time trying.