lftp and "set bell-style none"

[tech_related]

Hello,

I am just another happy user of lftp 2.2.4 and I would like to know whether
there is any way in which I can make it behave silently; I know that lftp aims at a
"shell-like" behaviour (background jobs, auto-completion, etc), and I am
wondering whether there is anything similar to "set bell-style none".

Thank you for any tip,

Manuel