BOSS CE2 SINE WAVE LFO MOD

[medioni]

Hi,
as you can read, I would like to get some sine wave vibrato out of my boss ce2 (it's from tonepad ).
I already did the vibe switch mod but I am looking for a sine wave.
The best would be a wave form switch but I don't know how to modifie the LFO section.
I found something on this site (:https://www.muffwiggler.com/forum/viewtopic.php?t=122937&sid=aa66b56472ed03bf6bf31b966be6ad1d) but it's unclear and I would appreciate your expertise!
Merci!:D