[PD] [PD-dev] REQUEST: Passed parameters into subpatch

[Matt Davey]

Creation arguments for subpatches is something i have wanted for years.
Would come in very handy in a few cases.

Like, when you need to make just 2 copies of something in a patch.  Left /
right pairs for stereo processing, etc.  Much easier just to have 2
subpatches than save a separate abstraction file, especially if you're
working on a big project with lots of files.  Also makes it easier to share
things with people if you only have to share one .pd file rather than a
folder with abstractions, etc.

But the main thing i have always wanted it for is for state saving.  If
there was something akin to $0 for subpatches, then they could be uniquely
identified, and uniquely tied to an enclosed abstraction.  So, say you have
a simple volume control abstraction ( inlet~ -> *~ -> outlet ), and you
enclose that it [pd volume] subpatch which is just a graph-on-parent
slider.  If you could do something like [pd volume #0] and have that
argument unique to that subpatch, and then put [volume-abstraction #0]
inside that subpatch, then you would have unique caller / listener pairs
for that subpatch only, but also have the ability to save the state of the
slider in the subpatch by setting it to 'init'.
So, in effect, you could create any number of [pd volume #0] subpatches,
and all have them with their own independent slider values that can be
saved in the parent patch.
For simple examples like that, maybe not too much to be gained...can just
use an inlet to the abstraction and join it that way.  But would be very
useful for larger patches with multiple GUI elements.  Would save a lot of
messy cable joining, and [route 0 1 2 3 4 5 6 7] etc solutions.
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