* First select the number $(1,\text{...}, 8)$ of the exercise.
* A task description is displayed. The parameter values are adjusted.
* Solution after pressing "Show solution".
* The number $0$ corresponds to a "Reset": Same setting as at program start.
* In the following descriptions, $f_{\rm S}$, $f_{\rm E}$ and$f_{\rm D}$ are each normalized to the reference frequency $f_{\rm 0}$.