I used to be able to change the output to mono regardless of the input I used. Is this still possible in Garageband 10?

Question

I have several speeches recorded in Garageband. I mistakenly created the tracks as two input tracks, but in reality, they were only mono. Previously in Garageband, one could select the inputs for a track even after it was recorded, thus changing a two input/stereo recording into a mono. Now, I do not see that setting at all. I do see the two circles next to the track title on the track itself, but nowhere does it allow me to make a change. Does anyone know whether I can select the inputs for a track after it has been recorded? The Inspector has many different effects, but I am admittedly overwhelmed by the number of them in this case and have not seen one that permits the kind of adjustment I want to make.
Any ideas? (i would rather not have to do something like input them into iTunes in order to manipulate them which I hear might work but is not what I would call an elegant solution to the problem)

Answer 1

Almost immediately after I asked the question, I tried one more option. I created a new track with only one input. I copied my two input track into it and suddenly it was heard in both channels as if it was a mono recording. It did not make any difference which input I had used to record it originally, I tested adding a track with Input 1 and then Input 2 and both behaved the same way.
I realize there may be other ways to do this. Feel fee to add your input.