legal makign a virus editor free?

[djbrynte]

just wonderign if its legal or illegal if its free =)

[trogluddite]

Nothing wrong with an editor per se - there's no copyright on sending whatever MIDI messages you want from a plugin of your own design.
You need to be more careful with panel designs, logos and trademarks because those are legally protected.
Having said that, it's very unlikely that the manufacturers would object - having a nice editor available makes their flashy hardware even more desirable to their potential customers, so I'd have thought they'd be more likely to see it as free marketing.