Anybody know anything about Macs? In theory my (2015 retina-build, so not the newest) Apple computer will, and iTunes and QuickTime players both say they will, but try to get them to actually do it! Earlier today I downloaded a midi from a highly trusted source but the error messages all said it contravened the security settings I had supposedly agreed to (I didn't) but cannot find ANYwhere how to undo. Gah!!!