Hey there Peter, welcome to WindWorks, great to have you here. I’ll have a look but I am guessing I don’t use the tuning slide. The rationale is that given the process is going through the harmonmic series, the notes will be out of tune and I want the focus to be on optimum efficiency. You’ll discover as you progress through the course that there are many harmonic series exercises so don’t stress about using the slide. Best Wishes, Greg