Loft a swept tube

Hello

I'm wanting to have this similar looking feature except with 3 different diameter profiles, using my existing path.

this would be a loft feature? (correct) I read something about a guide curve. (instead of a path)

I tried this with no luck, the loft simply connected the three dias.

anybody could help me or give advise would be great!

thanks

SolidworksParts And Features