If you are using EZdrummer 2 you will need to update Metal Machine with the 'Toontrack EZX Metal Machine v1.5.0 Update OSX - R2R' or it won't work (I would also update EZdrummer 2 to v2.0.2). Note: You didn't mention whether you are using EZdrummer v1 or v2 or if you are using Superior Drummer. Launch your DAW open either EZdrummer or Superior Drummer and you will see it there and it will work. You will need to follow the R2R instructions + run the keygen on your Mac. Personally I would grab the 'Metal Machine.iso' and go that route just to play it safe.
If you don't have the 'Metal Machine.iso' you can use the same procedure above and just copy the files over to your Mac. Then copy the 'Midi' folder to the 'MY MIDIFILES' folder which is in the 'Midi' folder (that was the only way I was able to see and get the Midi files to work). Copy the 'EZX_MetalMachine' folder (it has all the files you need) to your 'EZdrummer' library folder (located where you have all your other EZdrummer libraries). Open the 'Install' folder and you will see a folder 'EZHOME', open it. Mount the 'Metal Machine.iso' EZX on your Mac.
