Le terme dans nos contrées c'est frein filet ou résine de blocage et oui, ça marche bien sur les prise jack.
Éviter le "Fort", le "médium" suffit largement pour cette utilisation.
“The type of cap is not as important as the value of the cap, for guitar. In an Amp, your cap type is much more important, as the signal is being passed through the cap all the time. In a guitar, you’re not hearing the cap itself, you’re hearing what the cap is impeding”. Lindy Fralin