I have a patch in which I have an array I would like to name: $0-sound-data but when I run the patch

At runtime I get an error: "0-sound-data: no such table"

My immediate problem is naming the array so I can include the patch as a sub-patch in other patches with out a name collision. I am a beginner at Pure Data but I thought prefixing with $0 was the way to do it

My more general problem is where can I read definitive documentation of where the "$" variables can be used? this is helpful, but clearly not the whole story

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@Worik $1 etc. in an object box will expand to the abstraction's arguments. $0 is a special number that is specific to each patch.

In message boxes, $1 $2 etc. refer to the 1st, 2nd, etc. elements of the incoming message to the message box.

So, $0 can only have meaning in object boxes (there have been proposals to expand it in message boxes as well but it hasn't happened yet). In your patch you're sending $0 from a message box. instead you can do something like

[inlet file name]
|
[pack s $0]
|
[read -resize $1 $2-sound-data(
|
[soundfiler]

so, you pass the $0 number to pack as an argument and pack it into a list with the incoming file name. Then that list is passed as a message to the message box, where the file name will be the 1st element in the message (and expand from $1 in the message box) and the patch $0 will be the 2nd element in the message (expand from $2 in the message box)