How to attach Attack from the volume envelope to a knob in KSP?

An exemple in the KSP manual: verything lies in the last three digits corresponding to the group on a 0 basis.

https://www.native-instruments.com/ni-tech-manuals/ksp-manual/en/engine-parameter-commands.html#get_mod_idx--

It seems complicated at first but as you write and code, it improves in understanding.

This sticky thread is quite useful when it comes to modulators:

As for the ENGINE_PAR_ATTACK, you can also do:

on init

  declare $i

  declare ui_slider $attack(0,1000000)

  make_persistent($attack)

end on

on ui_control($attack)

  $i := 0

    while ($i<$NUM_GROUPS)

      set_engine_par($ENGINE_PAR_ATTACK,$attack,$i,0,0)

      inc($i)

    end while

end on

A while loop lets you apply the same command to different groups or slots without repeating the code.

1. $i is the counter:
   • $i := 0 starts the loop at 0, but you can start at any number.
2. The Loop Condition:
   • while ($i < $NUM_GROUPS) the loop runs as long as $i is less than $NUM_GROUPS
   • $NUM_GROUPS is a built-in KSP variable that tells you how many groups there are in a Kontakt instrument. The first group is always group index 0.
3. Inside the Loop:
   • set_engine_par($ENGINE_PAR_ATTACK, $attack, $i, 0, 0) this sets the attack parameter for the current group $i
   • inc($i) this increases $i by 1, so the next loop works on the next group
4. Ending the Loop:
   • end while the loop stops when $i is no longer less than $NUM_GROUPS

Note that you can achieve the same result with less code if you use Sublime Text Editor to write your scripts. Example:

for i:= 0 to NUM_GROUPS - 1
  set_engine_par(ENGINE_PAR_ATTACK, attack, i, 0, 0)
end for