I just discovered and installed MidiO http://mac.dailydownloaded.com/en/mp3-audio-software/audio-production-recording-software/4955-midio-download-install Just be careful as to which green button you press to download, as the bigger buttons tend to be for other apps who advertise an the page
It is an Audio Unit plugin that generates MIDI Out for GarageBand software instrument tracks. It can be used to directly drive either external MIDI devices or standalone software synths. The plugin can NOT directly export MIDI tracks to disk.
Open the 'read me' and follow the simple instructions.
I got it playing the piano briefly (and loudly) from Garage Band but it has now stopped doing so – and I have yet to track down why.
I HAVE previously used Garage Band to synchronise a Movie file on my large screen computer, with an audio track (.wav generated from midi) which played 'live' my old PianoDisc grand thru the rear of the CD unit. But because we, in Australia, are NOT permitted to have the Yamaha Subscriptions for Video & Radio, I am trying now to match my midis of the e-competition with the videos of the same performances to achieve some recordings which combine Video & audio playing the Disklavier – just you get via your Subscription in the States
Ian Williamson