[PD] line: grain rate and delta

[tim vets]

Hi all,
I'm a bit confused about the grain rate of [line]
the help says that 'the default grain rate is 20 ms'
however, when I connect a [delta] to a [line], it shows zero's,
while inserting a [speedlim 20] changes that.
also some other tests in attached patch.
can someone explain ?
Thanks,
Tim
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