kslider: dynamic velocity list (so close yet so far)

Hi all ,

As the title indicates, I'm trying to create a list of velocity values with the kslider.
I can use [bag] in combo with zl.group for storing and erasing key values

But since velocity values are constantly varying , I cannot use [bag] .
So I resorted to good old [coll] <- to try and create a bag equivalent but for velocity values.

As you'll see in my patch , I use the key value as the i.d. for velocity value <- that way I can delete it later.

It almost works , but I run into robustness issues when testing with preset and with a live keyboard and [notein]

(the end goal is to reproduce Logic Pro's arp MIDI FX. It has the velocity as played option)

Here is the patch:

Thank a lot in advance