Here is version 02, with the curve plotted from seed to seed, with nested For loops.
(See .htm file for some explanation.)
Index (j+1) is equal to the seedID number.
Index i in fraction formula (i / (numpoints-1)) is added to j to yield t.
Nesting the For loops was easy, although I could not figure it out last week :-)

This scheme would permit ramping the value of z up and down between (randomly) selected (sequential) seeds.
The i fraction could be used for the ramp.
(This code has not been done yet.)

- Brian

Now to make it play music...