I'm glad you pointing things out for me to understand. thanks much much:-)

@whale-av

"$0 can be used in any object as part of the name or the address, which means that a message cannot escape from the abstraction. A sub-patch like [pd my-subpatch] will be given the same number."

If I'm correctly following you, this quote from your post looks satisfying my need.?.?

Hey!, I've found my bug! thanks. I was using several duplicates of an abstraction that each one contains array 'A','B','C','D'.
But still in trouble of resolving this issue. how can I set each abstraction's arrays unique while creating multiple of this abstraction in a patch??

warning: D: multiply defined
warning: D: multiply defined
warning: C: multiply defined
warning: C: multiply defined
warning: B: multiply defined
warning: B: multiply defined
warning: A: multiply defined
warning: A: multiply defined
warning: D: multiply defined
warning: D: multiply defined
warning: C: multiply defined
warning: C: multiply defined
warning: B: multiply defined
warning: B: multiply defined
warning: A: multiply defined
warning: A: multiply defined

I was not troubled by this so far operating the patch of this, but still wondering what this is? Can this be resolved? Could this be causing a problem in the future?

@whale-av I meant, 'list-len'. But I looked up the extension 'list-abs' to settle this

@whale-av Thanks!, That resolved it.

@whale-av I noticed an error occurs on console, saying couldn't create 'list-something' or 'compare-any', 'import-disabled list abs'.
I'm using 0.48.1. Am I using the wrong PD?
What am I doing it wrong?

@LiamG Thanks! This is what I was looking for and much more. I think this will come handy in general.

while working on a generative music patch, I had a struggle that is creating a sequencer saves pattern which written during the session.
I could see how I can achieve this easily with wiring but can this be possible with click of a button as how toggle does, which also saves it for the next time??

Great help! thanks ingox!

Why my message box doesn't receive(review) any messages from <list prepend set> object?

Sorry, basic learner here, I wish to review my frequencies going in message boxes as my book showed (Designing Sound), and couldn't figure it out by myself. But does message boxes review any list with only receiving float list?