Steve, what does this waveform anomaly tell you?

Oh yes - very poorly judged edit! Fails on two counts; firstly there is the obvious jump, which is going to ask the D-A converter to travel instantaneously from one value to another, rather than at the rate of change it was previously progressing at. Secondly, if you look at the slope of the waveform it is joining to, it's travelling at a different rate (the slope is different). So it's going to click initially because of the attempt at a quantum leap, and secondly because it attempts to join two signals of different frequencies.

You can achieve all of this in Audition, of course. Just go to Edit>Preferences>Data and either take the checks out of the 'Smooth...' boxes or reduce both settings to zero. Then right-click on the timeline, select Snapping and take the check out of 'Snap to Zero Crossing'. Audition will then proceed to make a terrible mess of your editing. Remember to reset it all afterwards!