How to delay a playable

One of my custom timeline behaviour create internally a number of playables and bundles them up in a mixer in the CreatePlayable phase. I've took inspiration from the control track code and it's working well.

However I'd like to delay a bit these events so that they don't all play at once. "PlayableExtensions.SetDelay()" seemed to be exactly what I wanted, but it's marked as obsolete with the advicce to handle it with a custom scriptable. I have a hard time trying to wrap my head around this being not familiar with the playable API, I can't get to "chain" playables, unity always complaint when I try to connect more than one :

Here is my code (for now just trying to delay the whole mixer)

Code (CSharp):

1. public static Playable CreateMixerFromPlayables(PlayableGraph graph, List<Playable> playables)
2.         {
3.             // Create mixer behaviour
4.             Playable mixer = Playable.Create(graph, playables.Count);
5.  
6.             // Connect each playable to the mixer with same weight
7.             for (int i = 0; i != playables.Count; ++i)
8.             {
9.                 // Connect this playable in mixer's input port i
10.                 ConnectMixerAndPlayable(graph, mixer, playables[i], i);
11.             }
12.  
13.             // Create a playable to delay the whole mixer
14.             Playable premixer = Playable.Create(graph, 1);
15.             // Set delay duration
16.             premixer.SetDuration(5);
17.             // Connect mixer to premixer input
18.             graph.Connect(mixer, 0, premixer, 0);
19.  
20.  
21.             premixer.SetPropagateSetTime(true);
22.             mixer.SetPropagateSetTime(true);
23.  
24.             return mixer;
25.         }