I'm using a bank of filtergraphs in [nfilter 2] mode to create
variable bandpass filters, and I want to store and recall the filter
settings using pattr.
pattr doesn't connect to filtergraph, so I'm going to have to use some
scheme involving number boxes. (The other option is to use preset
values sent to filtergraph from message boxes).
What I haven't been able to find in the docs is - how to address the 2
separate filter curves in filtergraph.
I'm assuming that I can precede the freq/gain/Q settings with a
message and a number to indicate which curve - but what is it?!
(I also noticed that the 7th outlet of filtergraph (indicates which
filter is being edited) doesn't seem to do anything when I change
values using the mouse - a number box attached there jumps to  when
I move either of the 2 curves, and that's it!)
So the question is - how to address the separate curves in a
filtergraph using messages.