Finished!! What a great book... looking forward to a second volume. Soon, I hope!

Still working on it... I'm not giving up!

thanks for trying, Yoda - but still stuck I am. Help! Why is there a white line in one of the four waves on the page? Should I turn the page so that one is the first one? None of the waves on the page look like the waveforms online to me! Am I trying to hear which numbers line up withe gaps between...