What do you think about a seminar where you would play a handful of beginner jazz standards using the Quartet app? It seems like most standards are expected to be played in mid-tempo swing style. Perhaps you could show us examples of playing a couple of our beginner standards in low-tempo ballad style as well?
As I mention above there are different Quartet App āvolumesā - 6 in total. The 1st volume contains 150 jazz standard backing tracks and I have found this selection of tunes to be perfect for my practice needs.
If you search āQuartetā in the Apple/Android Store, you will see the different versions, and Iām sure that the tune library in Version 1 is perfectly adequate for you.
We used the Quartet app in some of my recent seminars on medium tempo improvisation, hereās an example: