Week 7 Lesson 3 - Composing tracks with the 'ur' function

Hello @yaxu,

I have a question related to patterning chords but did't know if this lesson is the right place post it (I can change it if not).
The point is I am trying to use ur to create a melody (here a simplified example):

let parts =
[
("a", n "c'maj" # s "superpiano"),
("b", n "a'maj" # s "superpiano"),
("c", n "f'maj" # s "superpiano")
]
in
d1 $ ur 3 "a b c" parts

but I'd like that Tidal started playing at the beginning. I tried with "trigger" and "qtrigger" functions but doesn't seem to work. (d1 $ trigger $ ur 3 "a b c" parts ). Is there an alternative?

Additionally, is there a way to play it just once? (if you use once instead of d1 it plays just "a".

Thanks for your help!