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Here it is folks, at long last!
Before using the editor, you will need to update the firmware on your Guitar Wing.
Instructions for the update are in a separate forum announcement:
Download the Guitar Wing Editor here:
Guitar Wing Editor 1.00 - Mac OS X (10.6+)
Guitar Wing Editor 1.00 - Ubuntu (12.04+)
Guitar Wing Editor 1.00 - Windows (7+)
Once you have updated to the new firmware, and your Wing is connected sending MIDI, open the editor.
In the very bottom left status bar you will see "USB Connected to Wing".
If the Wing controls on the screen are yellow, you are not connected to the Wing.
Check out this video for a quick walk through of the editor:
(EDIT: 11/11/14 - Added Link for Ubuntu (verified working on 12.04 and 14.04))
(EDIT: 11/11/14 - Updated Links to v0.23 (from v0.21))
(EDIT: 12/05/14 - Updated Links to v0.28 (from v0.23))
(EDIT: 01/12/15 - Updated Links to v0.31 (from v0.28))
(EDIT: 01/22/15 - Updated Links to v1.00 (from v0.31))