Thank you for your review
Email me when discounted: 

midiO is an AudioUnit plug-in for GarageBand adds a modicum of MIDI out support to GarageBand.

What's New

Version 1.3:
  • Passes AU validation under 10.6.
  • Can generate program and bank change messages.


  • Mac OS X 10.4 or later
  • GarageBand.

Similar Software

Open Comparison
Suggest Other Similar Software
Leave a Review

midiO User Discussion

Nobody has reviewed or commented on this app yet. Add your own comment and get a discussion going!
Sort by: Time | Smiles
midy Member IconComment+0

I cannot select anything from under the midi destination selection. It is stuck on 'None'. So of course I have no midi out. Anyone come across this problem?

Reply1 reply
Version 1.3

Had exactly the same problem using my old MacMini (PPC - 10.4). Managed to solve by using the previous version of MidiO 1.2, so search and download that instead (careful: some sites say 1.2 but then when you download its actually 1.3, check the Readme file to be sure). I found it here: http://midio.downloadaces.com/

Anonymous Member IconReview

Hmmm. I've installed it (or, rather, drag and droped it into the plugin/component folder. For some reason GarageBand will not show it in the dropdown menu inside track info. Have this problem with several (but far from all) of my AU plugins. Any clues, any one?

Reply0 replies
Version 1.14
Anonymous Member IconReview

Garage Band's sounds are great, but the parameter arrays for the synth modules are rather basic, and adjustments on the fly can't be automated. The lack of MIDI output is the biggest hinderance to any musician with existing MIDI equipment; this is the "missing link", as it were, without the expense of the oxymoronically named Logic.

(Oh, now I understand: its called "Logic Audio" because (a) it uses 1s and 0s, not because the user interface is sensible or intuitive; and (b) "Obtuse, Time Wasting Clap-Trap Audio" didn't appeal to the marketing depertment, even with "Platinum" tacked on the end)

Reply1 reply
Version 1.14
Anonymous Member Icon

er... have you ever tried using Logic?
Perhaps ever tried reading the manual? Not the most simple but certainly one of the most intuitive programs I've ever used!

Midi AU plug-in? very nice, certainly the missing link, adds a very nice extra level of depth to Garageband that apple don't want you to have.... (think they'd rather you spend the cash on Logic express)

user icon+0
Version 1.3
> 5 2


Current Version (1.x)


Downloads 14,270
Version Downloads 7,575
License Free
Date 14 May 2010
Platform OS X / PPC 32 / Intel 32
Price Free
Learn how MacUpdate Desktop makes installing apps from MacUpdate.com one-click easy.
Next time, install midiO with 1-click

Learn how MacUpdate Desktop can install apps on MacUpdate with the simple click of the Install apps with MacUpdate Desktop icon. Plus, keep all your apps updated.