You can actually control rise, fall and duty independently for the trapezoid wave by pressing on the "RISE" key several times.

Thanks for the comments and questions. I think the next two videos may answer some of your questions about THD, etc. and I will post them as I finish the editing. As to external frequency standards, I definitely appreciate their usefulness in reducing the systematic error in measurement instruments, and would not do without the best standard I could afford in a professional metrology lab. However, in the teaching labs and hobby labs that are my primary focus these days I don't think they are as important, although they are still useful. For example, they synchronize the clocks in otherwise independent instruments. This can be both a blessing and a curse since a novice might think that two signals are correlated because of the common frequency source and assume that is always the case. It is a good idea to introduce new engineers to the pitfalls of uncorrelated sources and then to introduce them to the use of external standards to correlate their instruments. So I think it is best to have both worlds, a carefully calibrated lab and a slightly chaotic one since the contrast teaches multiple lessons.

@@tomtektest8042 Hi Tom, Thank you kindly for your prompt and detailed response. I'm eagerly waiting for your next videos! Cheers Mark

@@tomtektest8042 excellent answer regarding the external reference. I am learning electronics now (independently), and the only reason I dove this deep into external references and syncing signals is because of the chaos you mention. The lack of automated sychronicity is what shot me down this rabbit hole. Rabbit hole meaning "path of learning all sorts of other things" haha. So usefull to learn things as you need to learn them to fix issues you have. It's like discovering things the natural way.