midiO for Mac

Name: midiO
Rating: 3.8 (5 reviews)
Author: RetroWare

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midiO Analysis

AI Assisted Content · June 11, 2026

Not written by CNET Staff.

midiO is a free media player designed specifically for Mac users, focusing on MIDI file playback and manipulation. The software offers a user-friendly interface that allows users to easily load and control MIDI files, making it suitable for both casual listeners and music producers. Key features include support for a variety of MIDI file formats, customizable playback settings, and the ability to adjust tempo and instrument sounds, enhancing the overall user experience.

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Trial version

In addition to basic playback functions, midiO provides advanced features such as a visual representation of MIDI data, making it easier to analyze and edit compositions. The application supports various MIDI controllers, allowing for real-time interaction and performance. Overall, midiO serves as a versatile tool for anyone looking to explore the world of MIDI music on Mac.

midiO for Mac

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Full Specifications

GENERAL

Release: May 14, 2010

Latest update: June 11, 2026

Version: 1.3

OPERATING SYSTEMS

Platform: Mac

Operating System

Mac OS X 10.5
Mac OS X
Mac OS X 10.6
Mac OS X 10.4

Additional Requirements: None

POPULARITY

Total Downloads: 14,720

Downloads Last Week: 0

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User Reviews

3.8/5

5 User Votes

I do not get a pencil to set the midi channel
jorgecalderApril 12, 2015
Pros
I have not been able to make it work
Cons
I have not been able to make it work
Summary
I have Garageband '09 v5.1.398 on Mac OS X 10.6.8 I can select midiO's as generator but I do not get a pencil to set the midi channel. Please help
Super! Works like a charm. 4 of 5 stars
Cheeky KnightOctober 23, 2008
Pros
Cons
Summary
This review was originally posted on VersionTracker.com.<br />Thanks for providing this. It's guys like you who keep the Internet great! Does what it needs to. An installer would have earned a 5th star for polish, but as it, rtfm 'n it's not a problem :Ã‚Â¬] Thanks again! ~ J-man
Lame developer doesn't know how to make a mountable...
blueskyminingSeptember 20, 2004
Pros
Cons
Summary
...pkg!<br />This review was originally posted on VersionTracker.com.<br />And doesn't bother to warn downloader to use "Save Link to disk"!!! -3 stars
Whaddya know....the stuff woiks!
WeaselboySeptember 2, 2004
Pros
Cons
Summary
This review was originally posted on VersionTracker.com.<br />The author should be charging at least 10 bucks for this version. Works like a charm. If you own Garage Band and some external MIDI synths, you should have this tool.

Developer’s Description

By RetroWare

Adds MIDI out support to GarageBand

MidiO 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.

midiO for Mac

midiO Analysis

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midiO for Mac

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User Reviews

I do not get a pencil to set the midi channel

Super! Works like a charm. 4 of 5 stars

Lame developer doesn't know how to make a mountable...

Whaddya know....the stuff woiks!

Developer’s Description