QMidi FAQ

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QMidi does not launch/crashes on startup

Be sure to use the latest version of QMidi and delete the following files: "(home)/Library/Preferences/com.mixage.qmidi2.plist"
"(home)/Library/Preferences/com.mixage.qmidipro.plist"

NB: Starting from OS X 1.7 (Lion), the library folder is invisible. To access it, you can use the Finder "Go > Go To Folder" menu and type "~/Library/Preferences/".

I just tried to put in my registration code to my new copy of QMidi and it says:  "either the code is invalid or it doesn't match the name".  Could you please help?

Be sure to use the right version of QMidi:
If your serial starts with "QMDP", download the PRO version, else download the standard version:
http://www.mixagesoftware.com/#qmidi_download