The editor allows them to tweak everything from envelope generators, oscillator parameters, effects settings or even alter system-wide settings using a sleek graphic interface.
The MC-909 Editor is a simple and intuitive way to harness the full power of the MC-909. Not only that, but it might be worth a look if you are thinking of buy an MC.
Current MC-909 customers can simply go to:
System requirements include Mac OS 8.6 and 9.x or Mac OS x 10.2 or later