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Yes, the 4ms (PEG) pingable envelope generator is useful as it creates envelopes and divisions of envelopes in time with a clock pulse. Modulation with no way to sync to a tempo can be limiting.

I'm not familiar with the Tempi, but it looks very interesting!

Here is a useful video on practical uses for clock dividers by Mylar Melodies.

I would also highly recommend checking out Mylar Melodies channel; he is very good at explaining modular concepts.
https://www.youtube.com/user/hello6am

Regarding the sequential switch
https://www.modulargrid.net/e/doepfer-a-151-rev-2