Using analog comparators to get 2 different outputs depending on the input
Let's make two comparators. The first one is powered from +-15V. It has a window of -8.5...+9.5V with output +15V if it's in the window and -15V if not. Output of the first comparator is the positive power supply of the second comparator.
When the first outputs -15V, the second will be &quot;powered&quot; by -15V on the positive supply (from the 1st comp) and -15V rail on the negative side. I think some comparators will feel ok if they have input of higher voltage than both power rails, even if both power rails are at the same potential and it's effectively unpowered. THIS NEEDS CHECKING, QUICK GOOGLING SUGGESTED IT'S !!MAYBE!! POSSIBLE
The second comparator should have a window of -8.5V to -2V, so it outputs HIGH when within that range. It outputs 15V in that case, if it's in the other half, it outputs -15V. Now you need to convert it into 6V and -3V outputs, which, I think, is impossible without extra circuitry. I even tried to draw some circuits on paper now. If you can use external circuitry to scale down 30V output swing to 9V output swing and then offset it by 3V down, then you win. Can't make up anything else on the spot, but maybe it will inspire some interesting circuit idea.