Compound time is used a lot to swing a tune.
If you listen to music in 6/4 time you play a straight 1 2 3 4 5 6 ex just like you would play a Major C scale.
In compound time ex 6/8 time
if you played 1 2 3 4 5 6 what you would do is play the 1 and the 4 a lot louder than the 2,3,5,6 notes.
What you want is swinging movement back and forth between the 1 and 4, so the whole idea is set the metronome to play 2 beats to the bar (ie set it to 2/4).
If you need to play more compound time music, it is worth practicing a major scale in compound time
go up c-d-e f-g-a b-c-d e-f-g a-b-c go down c-b-a g-f-e d-c-b a-g-f e-d-c
play the 1st note of each triplet loud and softer on the 2nd and 3rd notes.
It’s a completely different way to play a major scale