Thank you very much for your answer.
I think I won't need the wires to exceed 50 cm, but I'll investigate further about shielded wires, just in case.
That"s one of the aspects that I deeply appreciate with modular systems : the more you spend time using it, the more you learn interesting info about music, electronics, mechanics...
Especially when people are so inclined to answer your questions !
Have a nice day,
Best regards,
Thomas