xl97:
There was a click issue due to (forgive my memory) a dual startup in the original class... but not sure if that was addressed, or even an issue, in the class here.
I don't remember that issue, but if it was raised, I'm sure I fixed it then. Checking the current CPP, I don't see that happening.
The most likely fix of the clicking issue raised here is using a better power supply and external amplifier. Possibly better speakers will help