Your post #119 - it appears that some magic occurred to change that triangle to a sine wave.
Post #120 - the switch appears to be connected to the negative voltage input, thus validating the negative output. The problem is that 9 volts is more positive than 6, so the output should be positive.
Post #120 - the switch appears to be connected to the negative voltage input, thus validating the negative output. The problem is that 9 volts is more positive than 6, so the output should be positive.