Max/Msp SuperDirt timing problem

every day I try, and I’m still stuck with this problem. Now I understand messages are sent ahead of time, in batches at a specific rate defined by cFrameTimespan = 1/20 in BootTidal.hs.
But I still don’t find the good algorythm to schedule everything. For instance if I eval this :
d1 $ s “1 2 3”
1 will be received ahead of time or just in time?
And also if we change the cps, something like 1.056842, it will affect the cFrameTimespan?
Sorry if all of this seems to be obvious for you but I really need help to go further here.

Thank you very much :slight_smile: