This is not a hard problem.
Hardware-wise, you need a MIDI interface for your computer. A simple gizmo will cost you less than $40 and can open wonderful new doors. (I'm a horrible example) :-)
Then, for Mac OS 9.2 you need to install OMS 2.3.8.
I have that up on my site, at the bottom of this page:
http://www.RedMoon-Music.com/products/maxWerk/
It comes with instructions to make a MIDI setup document. After you get through this procedure, updating any gear via sysex files will be a breeze.
Then go here:
http://members.home.net/sgrace9/sysex/
..and download the Sysex program--it's a small utility.
Go into its Preferences and tell it
Buffer size 1024
Timeout 1000ms.
% MIDI speed 60
Pause between messages 200ms.
These settings allow lots of leeway for big files--they are the settings Alesis recommended for updating Andromeda.
Under Options, "Select output device" (that will be Voyager).
Under the File menu, use "Open any" to point to the sysex file on your hard drive (sometimes Sysex is finicky about the simple "Open" command seeing files. You get a little window with a Transmit button.
Follow the OS update instructions for prepping the Voyager. I just did this, and it works like a charm. You can now call yourself a MIDIOT!
Remember the new version of the alphabet! "B" now comes before "A", and then "C" (Joke! --refers to the update instructions. Hey, if the Moog folks say so, that works for us!)
Next thing you might want to look into after the update is a basic MIDI sequencer for your G3 just to explore the possibilities (evil laugh), but this is enough to worry about for now.
--Çikira
www.cikira.com
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evolutionary electronica
www.redmoon-music.com
SynthSights! it's not about the gear
groups.yahoo.com/group/SynthSights