Whenever i go into my friend's Minecraft online play, I talk to him on my microphone and he never seems to hear me and he says hes talking but i cannot hear him.On another note whenever i generate a world, i can find no caves. I can find divits, mini ravines and craters. BUT NO CAVE SYSTEMS! Please help and thank you.
How much digging have you done? I always start by staircasing down from in my house and, if that doesn't yield any caves, shoot off narrow passageways about Y=35. Sometimes it takes a few hundred blocks to hit jackpot, but sometimes its immediate.
Have you tried seeds from the Seed Forum that describe lotsa caves?