Thanks @sixolet for your help
For those who are interested, need to modify lepidoptery.lua
line 188 :

params:add_control(n("memory", i), "memory", controlspec.new(0.05, 2, 'exp', 0, 1, 's'))

modify number 2

and line 294

(edit error lines numbers)

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ok thanks! so no need to modify the .sc code, just the .lua?

lines 142 an 248 in my lepidoptery.lua are not the corresponding to the text you posted, just found the same in line 188, but no clue about that other line

Both lua and sc (see the last sixolet post for sc)

actually on github lines 188 and 294