(ftb infinity evolved)No sound after joining server

Hey Guys im new to the forum and i hope you can help me with this one.
Whne i start ftb infinity evolved everything is fine. I have sound in the overall menu and even in single player. But as soon as I join my friends server its gone. No sound whatsoever. I tried restarting the soud engine,I have everything on max volume and trying the mute unmute tactic doenst do anything either.Its only when i join my friends server that i have no sound, but in previous modpacks i had no problem with the server. I hope you can help me.